1.10.0

Switch from Travis CI to GitHub Actions for test runs

.eslintrc.js

@@ -1,13 +1,20 @@
 module.exports = {
-  parser: 'typescript-eslint-parser',
+  parser: '@typescript-eslint/parser',
   parserOptions: {
     sourceType: 'module',
     ecmaFeatures: {
       jsx: true,
     },
   },
-  plugins: ['prettier'],
+  plugins: ['prettier', '@typescript-eslint', 'react-hooks'],
   rules: {
-    'prettier/prettier': 'error',
+    '@typescript-eslint/explicit-function-return-type': 'off',
+    'react-hooks/rules-of-hooks': 'error',
+    'react-hooks/exhaustive-deps': [
+      'error',
+      {
+        additionalHooks: '(useSelector|useAppSelector|useActionCreator)',
+      },
+    ],
   },
-};
+}

.github/workflows/ci.yml

@@ -0,0 +1,43 @@
+name: Node.js CI
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [10.x, 12.x, 14.x]
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node-version }}
+      - run: npm install
+      - run: npm test
+        env:
+          CI: true
+
+      - name: Coveralls Parallel
+        uses: coverallsapp/github-action@master
+        with:
+          github-token: ${{ secrets.github_token }}
+          flag-name: run-${{ matrix.node-version }}
+          parallel: true
+
+  finish:
+    needs: test
+    runs-on: ubuntu-latest
+    steps:
+      - name: Coveralls Finished
+        uses: coverallsapp/github-action@master
+        with:
+          github-token: ${{ secrets.github_token }}
+          parallel-finished: true

.travis.yml

@@ -1,3 +0,0 @@
-language: node_js
-node_js:
-  - '9'

CHANGELOG.md

@@ -1,55 +1,215 @@
-## [Unreleased]
+## Unreleased
+
+## [1.10.0] - 2020-09-29
+
+### Added
+
+- Support for importing profiles from Safari [[#300](https://github.com/jlfwong/speedscope/pull/300)] (by [@radex](https://github.com/radex))
+
+### Fixed
+
+- Fixed browser not opening on Windows when using the CLI [[#307](https://github.com/jlfwong/speedscope/pull/307)] (by [@spillerrec](https://github.com/spillerrec))
+- Fixed import of UTF-16 encoded files w/ BOM [[#314](https://github.com/jlfwong/speedscope/pull/314)]
+- Removed accidental dependency on React [[#315](https://github.com/jlfwong/speedscope/pull/315)]
+
+## [1.9.0] - 2020-08-05
+
+### Added
+
+- Provide prev/next buttons to cycle through search results, make search results more visually prominen [[#304](https://github.com/jlfwong/speedscope/pull/304)]
+
+### Fixed
+
+- Fix accumulated errors in Chrome profile imports caused by zeroed negative timeDeltas [[#305](https://github.com/jlfwong/speedscope/pull/305)] (by [@taneliang](https://github.com/taneliang))
+
+## [1.8.0] - 2020-07-19
+
+### Added
+
+- Added search highlighting in time order & left heavy views [[#297](https://github.com/jlfwong/speedscope/pull/297)]
+
+### Fixed
+
+- Fix performance issues for the caller/callee flamegraphs in the sandwich view [[#296](https://github.com/jlfwong/speedscope/pull/296)]
+
+## [1.7.0] - 2020-07-13
+
+### Added
+
+- Introduced filtering via Ctrl+F/Cmd+F into the sandwich view [[#293](https://github.com/jlfwong/speedscope/pull/293)]
+
+## [1.6.0] - 2020-05-30
+
+### Added
+
+- Improved profile/thread selection UI [[#282](https://github.com/jlfwong/speedscope/pull/282)]
+
+### Fixed
+
+- Crash instead of incorrectly interpreting profiles with incorrectly ordered events [[#273](https://github.com/jlfwong/speedscope/pull/273)]
+- A large refactor to upgrade to Preact X was performed [[#267](https://github.com/jlfwong/speedscope/pull/267)]
+
+## [1.5.3] - 2020-01-16
+
+### Fixed
+
+- Bump dependency versions to unbreak build [[#253](https://github.com/jlfwong/speedscope/pull/253)] (by [@jlfwong](https://github.com/jlfwong), with changes from [@Archerlly](https://github.com/Archerlly)'s [#215](https://github.com/jlfwong/speedscope/pull/215))
+- Trace event: Prevent event re-ordering from generating incorrect flamegraphs ([#252](https://github.com/jlfwong/speedscope/pull/252), with changes from [@hwajaywang](https://github.com/hwajaywang)'s [#249](https://github.com/jlfwong/speedscope/pull/249))
+- Make tooltip width wider [[#239](https://github.com/jlfwong/speedscope/pull/239)] (by [@miso11](https://github.com/miso11))
+
+## [1.5.2] - 2019-10-10
+
+### Fixed
+
+- Fix emscripten remapping when symbols are hex-escaped, like `a\20b` [[#233](https://github.com/jlfwong/speedscope/pull/233)] (by [@jyc](https://github.com/jyc))
+
+## [1.5.1] - 2019-06-06
+
+### Fixed
+
+- Fixed import of trace event files which contain unmatched "E" events ([#222](https://github.com/jlfwong/speedscope/pull/222)) (by [@jlfwong](https://github.com/jlfwong))
+
+## [1.5.0] - 2019-02-17
+
+### Added
+
+- Support importing unterminated JSON in simple cases ([#208](https://github.com/jlfwong/speedscope/pull/208)) (by [@jlfwong](https://github.com/jlfwong))
+
+### Fixed
+
+- Fix crash when importing from stackprof without raw_timestamp_deltas ([#207](https://github.com/jlfwong/speedscope/pull/207)) (by [@jlfwong](https://github.com/jlfwong))
+- Alert instead of crash when importing a file containing no profiles ([#205](https://github.com/jlfwong/speedscope/pull/205)) (by [@jlfwong](https://github.com/jlfwong))
+- Fixed import of multithreaded profiles from Chrome 66 ([#206](https://github.com/jlfwong/speedscope/pull/206)) (by [@jlfwong](https://github.com/jlfwong))
+- Fixed import of instruments trace files with missing run number ([#203](https://github.com/jlfwong/speedscope/pull/203)) (by [@Archerlly](https://github.com/Archerlly))
+
+## [1.4.1] - 2019-01-22
+
+### Fixed
+
+- Fix importing of Trace Event Format files with no ts field on M events [[#198](https://github.com/jlfwong/speedscope/pull/198)] (by [@jlfwong](https://github.com/jlfwong))
+
+## [1.4.0] - 2019-01-22
+
+### Added
+
+- Import v8 cpu profile (old format) [[#177](https://github.com/jlfwong/speedscope/pull/177)] (by [@vmarchaud](https://github.com/vmarchaud))
+- Import basic "Trace Event Format" profiles [[#197](https://github.com/jlfwong/speedscope/pull/197)] (by [@jlfwong](https://github.com/jlfwong))
+
+## [1.3.2] - 2018-12-03
+
+### Fixed
+
+- Fixed import of multithreaded Chrome profiles [[#19](https://github.com/jlfwong/speedscope/pull/19)] (by [@jlfwong](https://github.com/jlfwong))
+
+## [1.3.1] - 2018-11-08
+
+### Fixed
+
+- Fixed a file import performance regression by using TextDecoder [[#188](https://github.com/jlfwong/speedscope/pull/188)] (by [@jlfwong](https://github.com/jlfwong))
+
+## [1.3.0] - 2018-10-29
+
+### Added
+
+- Support import from Haskell GHC JSON format support [[#183](https://github.com/jlfwong/speedscope/pull/183)] (by [@trishume](https://github.com/trishume))
+
+### Fixed
+
+- Make the wasd keymappings work on azerty keyboards [[#184](https://github.com/jlfwong/speedscope/pull/184)] (by [@vrischmann](https://github.com/vrischmann))
+- Fix import of binary formats via profileURL [[#179](https://github.com/jlfwong/speedscope/pull/179)] (by [@f](https://github.com/f)-hj)
+
+## [1.2.0] - 2018-10-08
+
+### Added
+
+- Add import of v8 heap allocation profile [[#170](https://github.com/jlfwong/speedscope/pull/170)] (by [@vmarchaud](https://github.com/vmarchaud))
+
+## [1.1.0] - 2018-09-26
+
+### Added
+
+- Add go tool pprof import support [[#165](https://github.com/jlfwong/speedscope/pull/165)]
+
+## [1.0.4] - 2018-09-12
+
+### Fixed
+
+- Fix import from Chrome < 69 when there are multiple profiles [[#161](https://github.com/jlfwong/speedscope/pull/161)]
+
+## [1.0.3] - 2018-09-10
+
+### Fixed
+
+- Fix import for Chrome 69, support leading idle time before first call [[#160](https://github.com/jlfwong/speedscope/pull/160)]
+
+## [1.0.2] - 2018-09-04
+
+### Fixed
+
+- Allow optional CR before LF when probing collapsed stacks files [[#154](https://github.com/jlfwong/speedscope/pull/154)]
+- Fix import for Firefox 63 [[#156](https://github.com/jlfwong/speedscope/pull/156)]
+- Change time formatting for minutes from 1.50min to 1:30 [[#153](https://github.com/jlfwong/speedscope/pull/153)] (by [@Alex](https://github.com/Alex)-Diez)
+
+## [1.0.1] - 2018-08-23
+
+- Fixed an issue where flamegraph bounds were not always being cleared correctly, leading to visual artifacts [[#150](https://github.com/jlfwong/speedscope/pull/150)]
+
+## [1.0.0] - 2018-08-23
+
+### Fixed
+
+- Fixed rendering issues when switching between screens w/ different `devicePixelRatios` [[#147](https://github.com/jlfwong/speedscope/pull/147)]
 
 ## [0.7.1] - 2018-08-20
 
 ### Fixed
 
-* Removed dependency on regl in order to allow speedscope to run in strict content-security-policy environments [#140]
-* Fixed text culling bug [#143]
+- Removed dependency on regl in order to allow speedscope to run in strict content-security-policy environments [[#140](https://github.com/jlfwong/speedscope/pull/140)]
+- Fixed text culling bug [[#143](https://github.com/jlfwong/speedscope/pull/143)]
 
 ## [0.7.0] - 2018-08-16
 
 ### Added
 
-* Added support to import from linux `perf script` [#135]
+- Added support to import from linux `perf script` [[#135](https://github.com/jlfwong/speedscope/pull/135)]
 
 ## [0.6.0] - 2018-08-14
 
 ### Added
 
-* Added support for multiple threads/processes [#130]
-* Import all runs & threads from Instruments .trace files instead of just main thread from selected run [#130]
+- Added support for multiple threads/processes [[#130](https://github.com/jlfwong/speedscope/pull/130)]
+- Import all runs & threads from Instruments .trace files instead of just main thread from selected run [[#130](https://github.com/jlfwong/speedscope/pull/130)]
 
 ### Fixed
 
-* Ensure the JSON schema has actual contents [#133]
+- Ensure the JSON schema has actual contents [[#133](https://github.com/jlfwong/speedscope/pull/133)]
 
 ## [0.5.1] - 2018-08-09
 
 ### Fixed
 
-* Fixed broken CLI
+- Fixed broken CLI
 
 ## [0.5.0] - 2018-08-09
 
 ### Fixed
 
-* Fix emscripten remapping when symbols contain dashes, like `527:i32s-div` [#129]
-* Improved firefox import speed and fixed bugs in it [#128]
-* Prevent non-contiguous blocks in the time ordered flamechart from appearing as a single node for selection [#123]
-* Prevent dragging from changing selection [#122]
-* Clamp zoom to prevent floating point issues [#121]
-* Preserve view state when switching tabs [#100]
+- Fix emscripten remapping when symbols contain dashes, like `527:i32s-div` [[#129](https://github.com/jlfwong/speedscope/pull/129)]
+- Improved firefox import speed and fixed bugs in it [[#128](https://github.com/jlfwong/speedscope/pull/128)]
+- Prevent non-contiguous blocks in the time ordered flamechart from appearing as a single node for selection [[#123](https://github.com/jlfwong/speedscope/pull/123)]
+- Prevent dragging from changing selection [[#122](https://github.com/jlfwong/speedscope/pull/122)]
+- Clamp zoom to prevent floating point issues [[#121](https://github.com/jlfwong/speedscope/pull/121)]
+- Preserve view state when switching tabs [[#100](https://github.com/jlfwong/speedscope/pull/100)]
 
 ## [0.4.0] - 2018-07-21
 
 ### Added
 
-* Support for importing v8 logs from node [#98]
-* Optionally read from stdin via cli [#99]
+- Support for importing v8 logs from node [[#98](https://github.com/jlfwong/speedscope/pull/98)]
+- Optionally read from stdin via cli [[#99](https://github.com/jlfwong/speedscope/pull/99)]
 
 ## [0.3.0] - 2018-07-18
 
 ### Added
 
-* Support for remapping profiles using a wasm symbol file [#93]
+- Support for remapping profiles using a wasm symbol file [[#93](https://github.com/jlfwong/speedscope/pull/93)]

CODE_OF_CONDUCT.md

@@ -0,0 +1,73 @@
+# Contributor Covenant Code of Conduct:
+
+## Our Pledge
+
+In the interest of fostering an open and welcoming environment, we as
+contributors and maintainers pledge to making participation in our project
+and our community a harassment-free experience for everyone, regardless of
+age, body size, disability, ethnicity, gender identity and expression, level
+of experience, nationality, personal appearance, race, religion, or sexual
+identity and orientation.
+
+## Our Standards
+
+Examples of behavior that contributes to creating a positive environment include:
+
+* Using welcoming and inclusive language
+* Being respectful of differing viewpoints and experiences
+* Gracefully accepting constructive criticism
+* Focusing on what is best for the community
+* Showing empathy towards other community members
+
+Examples of unacceptable behavior by participants include:
+
+* The use of sexualized language or imagery and unwelcome sexual attention or advances
+* Trolling, insulting/derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or electronic address, without explicit permission
+* Other conduct which could reasonably be considered inappropriate in a professional setting
+
+## Our Responsibilities
+
+Project maintainers are responsible for clarifying the standards of
+acceptable behavior and are expected to take appropriate and fair corrective
+action in response to any instances of unacceptable behavior.
+
+Project maintainers have the right and responsibility to remove, edit, or
+reject comments, commits, code, wiki edits, issues, and other contributions
+that are not aligned to this Code of Conduct, or to ban temporarily or
+permanently any contributor for other behaviors that they deem inappropriate,
+threatening, offensive, or harmful.
+
+## Scope
+
+This Code of Conduct applies both within project spaces and in public spaces
+when an individual is representing the project or its community. Examples of
+representing a project or community include using an official project e-mail
+address, posting via an official social media account, or acting as an
+appointed representative at an online or offline event. Representation of a
+project may be further defined and clarified by project maintainers.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported by contacting
+[jamie.lf.wong@gmail.com](mailto:jamie.lf.wong@gmail.com). All complaints
+will be reviewed and investigated and will result in a response that is
+deemed necessary and appropriate to the circumstances. The project team is
+obligated to maintain confidentiality with regard to the reporter of an
+incident. Further details of specific enforcement policies may be posted
+separately.
+
+Project maintainers who do not follow or enforce the Code of Conduct in good
+faith may face temporary or permanent repercussions as determined by other
+members of the project's leadership.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor-Covenant][homepage],
+version 1.4, available at
+[https://contributor-covenant.org/version/1/4][version]
+
+[homepage]: https://contributor-covenant.org
+[version]: https://contributor-covenant.org/version/1/4/

CONTRIBUTING.md

@@ -0,0 +1,70 @@
+# Contributing to speedscope
+
+Hi! This is a short guide & set of guidelines for contributing to speedscope.
+Contributors of all skill levels are welcome to submit pull requests.
+
+This project adheres to the Contributor Covenant [code of conduct](./CODE_OF_CONDUCT.md).
+All contributors are expected to uphold this code of conduct.
+
+## Setting up for development
+
+To start running speedscope locally, run the following:
+
+    git clone https://github.com/jlfwong/speedscope.git
+    cd speedscope
+    npm install
+    npm run serve
+
+This should open up a running version of speedscope in your default browser.
+
+In your terminal, you should see something like this:
+
+    $ npm run serve
+    > speedscope@0.7.1 serve /Users/jlfwong/code/speedscope
+    > parcel assets/index.html --open --no-autoinstall
+
+    Server running at http://localhost:1234
+    ✨  Built in 7.30s.
+
+Most of speedscope is written in TypeScript. If you're unfamiliar with
+TypeScript, then you can either just try to learn it as you go, then the
+[official TypeScript
+documentation](https://www.typescriptlang.org/docs/home.html) may be of use
+to you!
+
+If you're not sure where the code you want to modify lives, the [`README.md`
+in the `src/` directory](./src/README.md) might be helpful.
+
+## Code formatting
+
+All TypeScript code in speedscope is automatically formatted with
+[Prettier](https://prettier.io/). This means that while you're writing your code,
+you don't have to worry about following a formatting guide, because a program will
+format your code for you!
+
+The easiest way to use Prettier is via an editor integration. See the [Editor
+Integration](https://prettier.io/docs/en/editors.html) page from Prettier's
+documentation for help with that.
+
+If you don't want to do that, you can alternatively run the autoformatter by
+running `npm run prettier`.
+
+## Running tests
+
+All TypeScript tests are written use [Jest](https://jestjs.io/). To run the
+tests, run `npm run jest`.
+
+## Contributing new features
+
+Before contributing code to implement a new feature, please open an issue to
+discuss it first. Large pull requests that are submitted without first getting
+maintainer buy-in are unlikely to be reviewed or merged.
+
+For features that will cause a visual change, please include visual mockups of
+the change you're planning on making.
+
+## Contributing bug fixes
+
+If you discover a bug, please file an issue. If the code change required to
+fix it is small (< ~20 lines), then feel free to just open a PR to fix the
+issue without trying to get buy-in ahead of time.

README-ADMINS.md

@@ -8,6 +8,7 @@ Publishing speedscope is a multi-step process:
 2.  Prepare the release
 3.  Publish to npm
 4.  Deploy the website
+5.  Upload a release to GitHub
 
 At time of writing, deployment assumes you're running macOS. It probably
 works if you're on a linux, and almost definitely does not work on Windows.
@@ -43,7 +44,7 @@ If everything looks good, proceed to "Prepare the release".
 2.  Update CHANGELOG.md to indicate the changes that were made as part of this release
 3.  Commit the changes with the version name as the commit message, e.g. `git commit -m 0.6.0`
 4.  `git tag` the release. We use tags like `v0.6.0`, e.g. `git tag v0.6.0`
-5.  `git push`
+5.  `git push && git push --tags`
 
 ## Publish to npm
 
@@ -54,17 +55,20 @@ a matter of running `npm publish`.
 
 To verify that the publish was successful, run `npm install -g speedscope`.
 Try `speedscope`, which should open speedscope in browser.
-Try `speedscope sample/profiles/stackcollapse/simple.txt`, which should immediately load the profile
+Try `speedscope sample/profiles/stackcollapse/simple.txt`, which should immediately load the profile.
 
 ## Deploying the website
 
+This step must follow the "Publish to npm" step, since it uses assets from
+the npm publish.
+
 https://www.speedscope.app/ is hosted on GitHub pages, and is published via pushing
 to the `gh-pages` branch. The `gh-pages` branch has totally different contents than
 other branches of this repository: https://github.com/jlfwong/speedscope/tree/gh-pages.
 
-It's populated by a deploy script which is invoked by running `npm run deploy` script.
-This will do a build of the static resources, and boot a local server for you to test
-the compiled assets. Please do not skip the manual testing in this step.
+It's populated by a deploy script which is invoked by running `npm run deploy` script. This populate a directory with assets pulled from npm, and
+boot a local server for you to test the compiled assets. Please do not skip
+the manual testing in this step.
 
 If everything looks good, you should be able to hit Ctrl+C, and you should see this prompt:
 
@@ -76,3 +80,14 @@ If everything looks good, type `yes` then enter. This will commit to the `gh-pag
 
 To check if a deploy has happened, you can check https://www.speedscope.app/release.txt
 which includes the version, the date, and the commit of the deploy.
+
+## Upload a release to GitHub
+
+This step must follow the "Publish to npm" step, since it uses assets from
+the npm publish.
+
+To make a zipfile suitable for uploading to GitHub as a release, run `scripts/prepare-zip-file.sh`.
+
+Once that's done, you should have a zip file in `dist/release/`
+
+Upload that file along with changelog notes to https://github.com/jlfwong/speedscope/releases/new

README.md

@@ -1,6 +1,6 @@
 # 🔬speedscope
 
-A fast, interactive web-based viewer for [sampling profiles][0]. An alternative viewer for [FlameGraphs][1]. Will happily display multi-megabyte profiles without crashing your browser.
+A fast, interactive web-based viewer for performance profiles. An alternative viewer for [FlameGraphs][1]. Will happily display multi-megabyte profiles without crashing your browser.
 
 Given raw profiling data, speedscope allows you to interactively explore the data to get insight into what's slow in your application, or allocating all the memory, or whatever data is represented in the profiling data.
 
@@ -13,6 +13,8 @@ Given raw profiling data, speedscope allows you to interactively explore the dat
 
 Visit https://www.speedscope.app, then either browse to find a profile file or drag-and-drop one onto the page. The profiles are not uploaded anywhere -- the application is totally in-browser.
 
+## Command line usage
+
 For offline use, or convenience in the terminal, you can also install speedscope
 via npm:
 
@@ -20,59 +22,42 @@ via npm:
 
 Invoking `speedscope /path/to/profile` will load speedscope in your default browser.
 
+## Self-contained directory
+
+If you don't have npm or node installed, you can also download a
+self-contained version from https://github.com/jlfwong/speedscope/releases.
+After you download the zip file from a release, simply unzip it and open the
+contained `index.html` in Chrome or Firefox.
+
 ## Supported file formats
 
-### Chrome
+speedscope is designed to ingest profiles from a variety of different profilers for different programming languages & environments. Click the links below for documentation on how to import from a specific source.
 
-Both the timeline format output by Chrome developers tools (https://developers.google.com/web/tools/chrome-devtools/evaluate-performance/reference#save) and the `.cpuprofile` format output are supported. The `.cpuprofile` format is useful for viewing flamecharts generated by Node.js applications:
-https://medium.com/@paul_irish/debugging-node-js-nightlies-with-chrome-devtools-7c4a1b95ae27
+- JavaScript
+  - [Importing from Chrome](https://github.com/jlfwong/speedscope/wiki/Importing-from-Chrome)
+  - [Importing from Firefox](https://github.com/jlfwong/speedscope/wiki/Importing-from-Firefox)
+  - [Importing from Safari](https://github.com/jlfwong/speedscope/wiki/Importing-from-Safari)
+  - [Importing from Node.js](https://github.com/jlfwong/speedscope/wiki/Importing-from-Node.js)
+- Ruby
+  - [Importing from stackprof](https://github.com/jlfwong/speedscope/wiki/Importing-from-stackprof-(ruby))
+  - [Importing from rbspy](https://github.com/jlfwong/speedscope/wiki/Importing-from-rbspy-(ruby))
+  - [Importing from ruby-prof](https://github.com/jlfwong/speedscope/wiki/Importing-from-ruby-prof)
+- Python
+  - [Importing from py-spy](https://github.com/jlfwong/speedscope/wiki/Importing-from-py-spy-(python))
+  - [pyspeedscope](https://github.com/windelbouwman/pyspeedscope)
+  - [Importing from Austin](https://github.com/p403n1x87/austin#speedscope)
+- Go
+  - [Importing from pprof](https://github.com/jlfwong/speedscope/wiki/Importing-from-pprof-(go))  
+- Rust
+  - [flamescope](https://github.com/coolreader18/flamescope)
+- Native code
+  - [Importing from Instruments.app](https://github.com/jlfwong/speedscope/wiki/Importing-from-Instruments.app) (macOS)
+  - [Importing from `perf`](https://github.com/jlfwong/speedscope/wiki/Importing-from-perf-(linux)) (linux)
+- [Importing from .NET Core](https://github.com/jlfwong/speedscope/wiki/Importing-from-.NET-Core)
+- [Importing from GHC (Haskell)](https://github.com/jlfwong/speedscope/wiki/Importing-from-Haskell)
+- [Importing from custom sources](https://github.com/jlfwong/speedscope/wiki/Importing-from-custom-sources)
 
-### Firefox
-
-The `profile.json` file format output by Firefox can be saved and import into speedscope: https://developer.mozilla.org/en-US/docs/Tools/Performance
-
-### Node
-
-If you record profiling information like so:
-
-    node --prof /path/to/my/script.js
-
-Then this will generate one or more `isolate*.log` files. You can open
-the resulting profile in speedscope by running the following command:
-
-    node --prof-process --preprocess -j isolate*.log | speedscope -
-
-### Instruments.app
-
-You can import call trees from OSX Instruments.app into speedscope by
-selecting a row in the "Profile" view and select "Edit -> Deep Copy" from the
-menu then pasting directly into speedscope. This data contains only aggregate
-statistics, so the "Time Order" view and the "Left Heavy" view will look very
-similar.
-
-You can also import `.trace` files for time profiles by dragging them directly
-into the browser from Chrome.
-
-### `stackprof` Ruby profiler
-
-If the `raw: true` flag is set when recording a dump, the resulting json dump can be imported into speedscope.
-
-### Linux `perf`
-
-You can import profiles recorded using `perf record` and formatted using `perf script`.
-
-    perf record -a -F 999 -g -p PID > perf.data
-    perf script -i perf.data > profile.linux-perf.txt
-
-Then drop the resulting `perf.txt` into speedscope, or if you have speedscope installed
-locally, you can run:
-
-    perf record -a -F 999 -g -p PID > perf.data
-    perf script -i perf.data | speedscope -
-
-### `DTrace`
-
-If you process the output of `DTrace` first with Brendan Gregg's `stackcollapse-*.pl` scripts (https://github.com/brendangregg/FlameGraph#2-fold-stacks), the result can be imported into speedscope.
+Contributions to add support for additional formats are welcome! See issues with the ["import source" tag](https://github.com/jlfwong/speedscope/issues?q=is%3Aissue+is%3Aopen+label%3A%22import+source%22).
 
 ## Importing via URL
 
@@ -81,26 +66,25 @@ To load a specific profile by URL, you can append a hash fragment like `#profile
 ## Views
 
 ### 🕰Time Order
-
-In the "Time Order" view (the default), the stacks are ordered left-to-right in the same order as the occurred in the input file, which is usually going to be the chronological order they were recorded in. This view is most helpful for understand the behavior of an application over time, e.g. "first the data is fetched from the database, then the data is prepared for serialization, then the data is serialized to JSON". This is the only flame graph order supported by Chrome developer tools.
-
-In all flamegraph views, the horizontal axis represents the "weight" of each stack (most commonly CPU time), and the vertical axis shows you the stack active at the time of the sample.
-
-If you click on one of the frames, you'll be able to see summary statistics about it.
-
 ![Detail View](https://user-images.githubusercontent.com/150329/42108613-e6ef6d3a-7b8f-11e8-93d4-541b2cb93fe5.png)
 
+In the "Time Order" view (the default), call stacks are ordered left-to-right in the same order as they occurred in the input file, which is usually going to be the chronological order they were recorded in. This view is most helpful for understanding the behavior of an application over time, e.g. "first the data is fetched from the database, then the data is prepared for serialization, then the data is serialized to JSON". 
+
+The horizontal axis represents the "weight" of each stack (most commonly CPU time), and the vertical axis shows you the stack active at the time of the sample. If you click on one of the frames, you'll be able to see summary statistics about it.
+
+
 ### ⬅️Left Heavy
+![Left Heavy View](https://user-images.githubusercontent.com/150329/44534434-a05f8380-a6ac-11e8-86ac-e3e05e577c52.png)
 
 In the "Left Heavy" view, identical stacks are grouped together, regardless of whether they were recorded sequentially. Then, the stacks are sorted so that the heaviest stack for each parent is on the left -- hence "left heavy". This view is useful for understanding where all the time is going in situations where there are hundreds or thousands of function calls interleaved between other call stacks.
 
 ### 🥪 Sandwich
+![Sandwich View](https://user-images.githubusercontent.com/150329/42108467-76a57baa-7b8f-11e8-815f-1df7b6ac3ede.png)
 
 The Sandwich view is a table view in which you can find a list of all functions an their associated times. You can sort by self time or total time.
 It's called "Sandwich" view because if you select one of the rows in the table, you can see flamegraphs for all the callers and callees of the selected
 row.
 
-![Sandwich View](https://user-images.githubusercontent.com/150329/42108467-76a57baa-7b8f-11e8-815f-1df7b6ac3ede.png)
 
 ## Navigation
 
@@ -133,3 +117,9 @@ Once a profile has loaded, the main view is split into two: the top area is the
 * `Cmd+O`/`Ctrl+O` to open a new profile
 * `n`: Go to next profile/thread if one is available
 * `p`: Go to previous profile/thread if one is available
+* `t`: Open the profile/thread selector if available
+* `Cmd+F`/`Ctrl+F`: to open search. While open, `Enter` and `Shift+Enter` cycle through results
+
+## Contributing
+
+Do you want to contribute to speedscope? Sweeeeet. Check out [CONTRIBUTING.md](./CONTRIBUTING.md) for instructions on setting up your dev environment.

bin/cli.js

@@ -4,7 +4,7 @@ const fs = require('fs')
 const os = require('os')
 const stream = require('stream')
 
-const opn = require('opn')
+const open = require('open')
 
 const helpString = `Usage: speedscope [filepath]
 
@@ -89,7 +89,11 @@ async function main() {
 
   console.log('Opening', urlToOpen, 'in your default browser')
 
-  await opn(urlToOpen, {wait: false})
+  // We'd like to avoid blocking the terminal on the browsing closing,
+  // but for some reason this doesn't work at all on Windows if we
+  // don't use wait: true.
+  const wait = process.platform === "win32";
+  await open(urlToOpen, {wait})
 }
 
 main()

package.json

@@ -1,6 +1,6 @@
 {
   "name": "speedscope",
-  "version": "0.7.1",
+  "version": "1.10.0",
   "description": "",
   "repository": "jlfwong/speedscope",
   "main": "index.js",
@@ -13,47 +13,70 @@
     "prettier": "prettier --write 'src/**/*.ts' 'src/**/*.tsx'",
     "lint": "eslint 'src/**/*.ts' 'src/**/*.tsx'",
     "jest": "./scripts/test-setup.sh && jest --runInBand",
-    "coverage": "npm run jest -- --coverage && coveralls < coverage/lcov.info",
-    "test": "tsc --noEmit && npm run lint && npm run coverage",
+    "coverage": "npm run jest -- --coverage",
+    "typecheck": "tsc --noEmit",
+    "test": "./scripts/ci.sh",
     "serve": "parcel assets/index.html --open --no-autoinstall"
   },
-  "files": ["bin/cli.js", "dist/release/**", "!*.map"],
-  "browserslist": ["last 2 Chrome versions", "last 2 Firefox versions"],
+  "files": [
+    "bin/cli.js",
+    "dist/release/**",
+    "!*.map"
+  ],
+  "browserslist": [
+    "last 2 Chrome versions",
+    "last 2 Firefox versions"
+  ],
   "author": "",
   "license": "MIT",
   "devDependencies": {
     "@types/jest": "22.2.3",
     "@types/jszip": "3.1.4",
-    "@types/node": "10.1.4",
+    "@types/node": "14.0.1",
     "@types/pako": "1.0.0",
+    "@typescript-eslint/eslint-plugin": "2.33.0",
+    "@typescript-eslint/parser": "2.33.0",
+    "acorn": "7.2.0",
     "aphrodite": "2.1.0",
-    "coveralls": "3.0.1",
-    "eslint": "4.19.1",
+    "eslint": "6.0.0",
     "eslint-plugin-prettier": "2.6.0",
-    "jest": "23.0.1",
+    "eslint-plugin-react-hooks": "4.0.2",
+    "jest": "24.3.0",
     "jsverify": "0.8.3",
     "jszip": "3.1.5",
     "pako": "1.0.6",
-    "parcel-bundler": "1.9.2",
-    "preact": "8.2.7",
-    "preact-redux": "jlfwong/preact-redux#a56dcc4",
-    "prettier": "1.12.0",
-    "quicktype": "15.0.45",
-    "redux": "^4.0.0",
-    "ts-jest": "22.4.6",
-    "typescript": "2.8.1",
+    "parcel-bundler": "1.12.4",
+    "preact": "10.4.1",
+    "prettier": "2.0.4",
+    "protobufjs": "6.8.8",
+    "redux": "^4.0.5",
+    "ts-jest": "24.3.0",
+    "typescript": "3.9.2",
     "typescript-eslint-parser": "17.0.1",
+    "typescript-json-schema": "0.42.0",
     "uglify-es": "3.2.2"
   },
   "jest": {
     "transform": {
       "^.+\\.tsx?$": "ts-jest"
     },
+    "setupFilesAfterEnv": [
+      "./src/jest-setup.js"
+    ],
     "testRegex": "\\.test\\.tsx?$",
-    "collectCoverageFrom": ["**/*.{ts,tsx}", "!**/*.d.{ts,tsx}"],
-    "moduleFileExtensions": ["ts", "tsx", "js", "jsx", "json"]
+    "collectCoverageFrom": [
+      "**/*.{ts,tsx}",
+      "!**/*.d.{ts,tsx}"
+    ],
+    "moduleFileExtensions": [
+      "ts",
+      "tsx",
+      "js",
+      "jsx",
+      "json"
+    ]
   },
   "dependencies": {
-    "opn": "5.3.0"
+    "open": "7.2.0"
   }
 }

prettier.config.js

@@ -4,4 +4,5 @@ module.exports = {
   semi: false,
   singleQuote: true,
   trailingComma: 'all',
-};
+  arrowParens: 'avoid'
+}

sample/profiles/node/10.11.0/example.cpuprofile

@@ -0,0 +1 @@
+{"head":{"functionName":"(root)","url":"","lineNumber":-1,"bailoutReason":"","id":1,"scriptId":0,"hitCount":0,"children":[{"functionName":"","url":"","lineNumber":0,"callUID":1,"bailoutReason":"","id":2,"scriptId":0,"hitCount":0,"children":[{"functionName":"a","url":"","lineNumber":0,"callUID":2,"bailoutReason":"","id":3,"scriptId":0,"hitCount":0,"children":[{"functionName":"b","url":"","lineNumber":5,"callUID":3,"bailoutReason":"","id":4,"scriptId":0,"hitCount":0,"children":[{"functionName":"d","url":"","lineNumber":13,"callUID":4,"bailoutReason":"","id":5,"scriptId":0,"hitCount":14,"children":[]}]},{"functionName":"c","url":"","lineNumber":9,"callUID":3,"bailoutReason":"","id":6,"scriptId":0,"hitCount":0,"children":[{"functionName":"d","url":"","lineNumber":13,"callUID":6,"bailoutReason":"","id":7,"scriptId":0,"hitCount":14,"children":[]}]}]}]}]},"startTime":163140,"endTime":163140,"samples":[2,5,5,5,5,5,5,5,5,5,5,5,5,5,5,7,7,7,7,7,7,7,7,7,7,7,7,7,7],"timestamps":[163140599286,163140610861,163140611921,163140612966,163140614236,163140615507,163140616694,163140617968,163140619238,163140620258,163140621507,163140622765,163140624037,163140625303,163140626378,163140627649,163140628923,163140630191,163140631457,163140632746,163140634032,163140635304,163140636440,163140637716,163140638990,163140640255,163140641520,163140642791,163140644063,163140645206]}

sample/profiles/speedscope/0.0.1/simple.speedscope.json

@@ -1 +1,81 @@
-{"version":"0.0.1","$schema":"https://www.speedscope.app/file-format-schema.json","shared":{"frames":[{"name":"a"},{"name":"b"},{"name":"c"},{"name":"d"}]},"profiles":[{"type":"evented","name":"simple.txt","unit":"none","startValue":0,"endValue":14,"events":[{"type":"O","frame":0,"at":0},{"type":"O","frame":1,"at":0},{"type":"O","frame":2,"at":0},{"type":"C","frame":2,"at":2},{"type":"O","frame":3,"at":2},{"type":"C","frame":3,"at":6},{"type":"O","frame":2,"at":6},{"type":"C","frame":2,"at":9},{"type":"C","frame":1,"at":14},{"type":"C","frame":0,"at":14}]}]}
+{
+    "$schema": "https://www.speedscope.app/file-format-schema.json",
+    "profiles": [
+        {
+            "endValue": 14,
+            "events": [
+                {
+                    "at": 0,
+                    "frame": 0,
+                    "type": "O"
+                },
+                {
+                    "at": 0,
+                    "frame": 1,
+                    "type": "O"
+                },
+                {
+                    "at": 0,
+                    "frame": 2,
+                    "type": "O"
+                },
+                {
+                    "at": 2,
+                    "frame": 2,
+                    "type": "C"
+                },
+                {
+                    "at": 2,
+                    "frame": 3,
+                    "type": "O"
+                },
+                {
+                    "at": 6,
+                    "frame": 3,
+                    "type": "C"
+                },
+                {
+                    "at": 6,
+                    "frame": 2,
+                    "type": "O"
+                },
+                {
+                    "at": 9,
+                    "frame": 2,
+                    "type": "C"
+                },
+                {
+                    "at": 14,
+                    "frame": 1,
+                    "type": "C"
+                },
+                {
+                    "at": 14,
+                    "frame": 0,
+                    "type": "C"
+                }
+            ],
+            "name": "simple.txt",
+            "startValue": 0,
+            "type": "evented",
+            "unit": "none"
+        }
+    ],
+    "shared": {
+        "frames": [
+            {
+                "name": "a"
+            },
+            {
+                "name": "b"
+            },
+            {
+                "name": "c"
+            },
+            {
+                "name": "d"
+            }
+        ]
+    },
+    "version": "0.0.1"
+}

sample/profiles/speedscope/invalid/incomplete-trace.json

@@ -0,0 +1,16 @@
+{
+  "$schema": "https://www.speedscope.app/file-format-schema.json",
+  "shared": {
+    "frames": [{"name": "A"}]
+  },
+  "profiles": [
+    {
+      "type": "evented",
+      "name": "p1",
+      "unit": "none",
+      "startValue": 0,
+      "endValue": 100,
+      "events": [{"type": "O", "frame": 0, "at": 0}]
+    }
+  ]
+}

sample/profiles/speedscope/invalid/out-of-order-events.json

@@ -0,0 +1,25 @@
+{
+  "$schema": "https://www.speedscope.app/file-format-schema.json",
+  "shared": {
+    "frames": [{"name": "A"}, {"name": "B"}]
+  },
+  "profiles": [
+    {
+      "type": "evented",
+      "name": "p1",
+      "unit": "none",
+      "startValue": 0,
+      "endValue": 100,
+      "events": [
+        {"type": "O", "frame": 0, "at": 0},
+        {"type": "C", "frame": 0, "at": 1},
+        {"type": "O", "frame": 1, "at": 2},
+        {"type": "O", "frame": 0, "at": 2},
+        {"type": "O", "frame": 0, "at": 3},
+        {"type": "C", "frame": 0, "at": 4},
+        {"type": "C", "frame": 1, "at": 4},
+        {"type": "C", "frame": 0, "at": 5}
+      ]
+    }
+  ]
+}

sample/profiles/stackcollapse/simple-crlf.txt

@@ -0,0 +1,5 @@
+a;b;c 1
+a;b;c 1
+a;b;d 4
+a;b;c 3
+a;b 5

sample/profiles/trace-event/multiprocess.json

@@ -0,0 +1,22 @@
+[
+  {"pid": 0, "tid": 0, "ph": "M", "name": "process_name", "args": {"name": "p0"}},
+  {"pid": 0, "tid": 0, "ph": "M", "name": "thread_name", "args": {"name": "p0t0"}},
+  {"pid": 0, "tid": 0, "ph": "X", "name": "alpha", "ts": 0, "dur": 1},
+  {"pid": 0, "tid": 1, "ph": "M", "name": "thread_name", "args": {"name": "p0t1"}},
+  {"pid": 0, "tid": 1, "ph": "X", "name": "beta", "ts": 0, "dur": 1},
+
+  {"pid": 1, "tid": 0, "ph": "M", "name": "process_name", "args": {"name": "p1"}},
+  {"pid": 1, "tid": 0, "ph": "M", "name": "thread_name", "args": {"name": "p1t0"}},
+  {"pid": 1, "tid": 0, "ph": "X", "name": "gamma", "ts": 0, "dur": 1},
+  {"pid": 1, "tid": 1, "ph": "M", "name": "thread_name", "args": {"name": "p1t1"}},
+  {"pid": 1, "tid": 1, "ph": "X", "name": "delta", "ts": 0, "dur": 1},
+
+  {"pid": 2, "tid": 0, "ph": "M", "name": "thread_name", "args": {"name": "p2t0"}},
+  {"pid": 2, "tid": 0, "ph": "X", "name": "epsilon", "ts": 0, "dur": 1},
+  {"pid": 2, "tid": 1, "ph": "M", "name": "thread_name", "args": {"name": "p2t1"}},
+  {"pid": 2, "tid": 1, "ph": "X", "name": "phi", "ts": 0, "dur": 1},
+
+  {"pid": 3, "tid": 0, "ph": "M", "name": "process_name", "args": {"name": "p3"}},
+  {"pid": 3, "tid": 0, "ph": "X", "name": "zeta", "ts": 0, "dur": 1},
+  {"pid": 3, "tid": 1, "ph": "X", "name": "eta", "ts": 0, "dur": 1}
+]

sample/profiles/trace-event/must-retain-original-order.json

@@ -0,0 +1,16 @@
+[
+  {"tid": 1, "ph": "B", "pid": 0, "name": "A", "ts": 0},
+  {"tid": 1, "ph": "B", "pid": 0, "name": "B", "ts": 0},
+  {"tid": 1, "ph": "B", "pid": 0, "name": "C", "ts": 0},
+  {"tid": 1, "ph": "E", "pid": 0, "name": "C", "ts": 1},
+  {"tid": 1, "ph": "E", "pid": 0, "name": "B", "ts": 2},
+  {"tid": 1, "ph": "E", "pid": 0, "name": "A", "ts": 3},
+  {"tid": 1, "ph": "B", "pid": 0, "name": "A", "ts": 4},
+  {"tid": 1, "ph": "B", "pid": 0, "name": "B", "ts": 5},
+  {"tid": 1, "ph": "B", "pid": 0, "name": "C", "ts": 6},
+  {"tid": 1, "ph": "E", "pid": 0, "name": "C", "ts": 7},
+  {"tid": 1, "ph": "E", "pid": 0, "name": "B", "ts": 7},
+  {"tid": 1, "ph": "E", "pid": 0, "name": "A", "ts": 7},
+  {"tid": 1, "ph": "B", "pid": 0, "name": "X", "ts": 7},
+  {"tid": 1, "ph": "E", "pid": 0, "name": "X", "ts": 10}
+]

sample/profiles/trace-event/simple-object.json

@@ -0,0 +1,9 @@
+{
+  "traceEvents": [
+    {"pid": 0, "tid": 0, "ph": "B", "name": "alpha", "ts": 0},
+    {"pid": 0, "tid": 0, "ph": "B", "name": "beta", "ts": 1},
+    {"pid": 0, "tid": 0, "ph": "X", "ts": 7, "tdur": 4},
+    {"pid": 0, "tid": 0, "ph": "E", "name": "beta", "ts": 13},
+    {"pid": 0, "tid": 0, "ph": "E", "name": "alpha", "ts": 14}
+  ]
+}

sample/profiles/trace-event/simple-partial-trailing-comma.json

@@ -0,0 +1,7 @@
+[
+  {"pid": 0, "tid": 0, "ph": "B", "name": "alpha", "ts": 0},
+  {"pid": 0, "tid": 0, "ph": "B", "name": "beta", "ts": 1},
+  {"pid": 0, "tid": 0, "ph": "X", "name": "gamma", "ts": 2, "dur": 5, "args": {"detail": "foobar"}},
+  {"pid": 0, "tid": 0, "ph": "X", "name": "epsilon", "ts": 7, "tdur": 4},
+  {"pid": 0, "tid": 0, "ph": "E", "name": "beta", "ts": 13},
+  {"pid": 0, "tid": 0, "ph": "E", "name": "alpha", "ts": 14},

sample/profiles/trace-event/simple-partial-whitespace.json

@@ -0,0 +1,13 @@
+
+
+[
+  {"pid": 0, "tid": 0, "ph": "B", "name": "alpha", "ts": 0},
+  {"pid": 0, "tid": 0, "ph": "B", "name": "beta", "ts": 1},
+  {"pid": 0, "tid": 0, "ph": "X", "name": "gamma", "ts": 2, "dur": 5, "args": {"detail": "foobar"}},
+  {"pid": 0, "tid": 0, "ph": "X", "name": "epsilon", "ts": 7, "tdur": 4},
+  {"pid": 0, "tid": 0, "ph": "E", "name": "beta", "ts": 13},
+  {"pid": 0, "tid": 0, "ph": "E", "name": "alpha", "ts": 14},
+
+
+
+

sample/profiles/trace-event/simple-partial.json

@@ -0,0 +1,7 @@
+[
+  {"pid": 0, "tid": 0, "ph": "B", "name": "alpha", "ts": 0},
+  {"pid": 0, "tid": 0, "ph": "B", "name": "beta", "ts": 1},
+  {"pid": 0, "tid": 0, "ph": "X", "name": "gamma", "ts": 2, "dur": 5, "args": {"detail": "foobar"}},
+  {"pid": 0, "tid": 0, "ph": "X", "name": "epsilon", "ts": 7, "tdur": 4},
+  {"pid": 0, "tid": 0, "ph": "E", "name": "beta", "ts": 13},
+  {"pid": 0, "tid": 0, "ph": "E", "name": "alpha", "ts": 14}

sample/profiles/trace-event/simple.json

@@ -0,0 +1,8 @@
+[
+  {"pid": 0, "tid": 0, "ph": "B", "name": "alpha", "ts": 0},
+  {"pid": 0, "tid": 0, "ph": "B", "name": "beta", "ts": 1},
+  {"pid": 0, "tid": 0, "ph": "X", "name": "gamma", "ts": 2, "dur": 5, "args": {"detail": "foobar"}},
+  {"pid": 0, "tid": 0, "ph": "X", "name": "epsilon", "ts": 7, "tdur": 4},
+  {"pid": 0, "tid": 0, "ph": "E", "name": "beta", "ts": 13},
+  {"pid": 0, "tid": 0, "ph": "E", "name": "alpha", "ts": 14}
+]

sample/profiles/trace-event/too-many-end-events.json

@@ -0,0 +1,8 @@
+[
+  {"pid": 0, "tid": 0, "ph": "B", "name": "alpha", "ts": 0},
+  {"pid": 0, "tid": 0, "ph": "B", "name": "beta", "ts": 1},
+  {"pid": 0, "tid": 0, "ph": "E", "name": "beta", "ts": 13},
+  {"pid": 0, "tid": 0, "ph": "E", "name": "alpha", "ts": 14},
+  {"pid": 0, "tid": 0, "ph": "E", "name": "gamma", "ts": 5},
+  {"pid": 0, "tid": 0, "ph": "E", "name": "delta", "ts": 5}
+]

sample/programs/go/.gitignore

@@ -0,0 +1,2 @@
+simple
+server

sample/programs/go/Makefile

@@ -0,0 +1,15 @@
+.PHONY: all clean linux-perf
+
+all: simple server
+
+clean:
+	rm -f simple server
+
+simple: simple.go
+	go build $<
+
+server: server.go
+	go build $<
+
+simple.prof: simple
+	./$< -cpuprofile=$@

sample/programs/go/server.go

@@ -0,0 +1,71 @@
+package main
+
+import (
+	"log"
+	"fmt"
+	"sync"
+	"time"
+	"net/http"
+)
+
+import _ "net/http/pprof"
+
+// See https://golang.org/pkg/net/http/pprof/ for details
+
+func alpha() {
+	z := 3
+	for i := 0; i < 100000; i++ {
+		z *= 3
+	}
+}
+
+func beta() {
+	z := 3
+	for i := 0; i < 100000; i++ {
+		z *= 3
+	}
+}
+
+func delta() {
+	z := 3
+	for i := 0; i < 100000; i++ {
+		z *= 3
+	}
+	alpha()
+	beta()
+}
+
+func gamma() {
+	z := 3
+	for i := 0; i < 100000; i++ {
+		z *= 3
+	}
+}
+
+
+func main() {
+    // we need a webserver to get the pprof webserver
+    go func() {
+        log.Println(http.ListenAndServe("localhost:6060", nil))
+    }()
+    fmt.Println("hello world")
+    var wg sync.WaitGroup
+    wg.Add(1)
+    go leakyFunction(wg)
+    wg.Wait()
+}
+
+func leakyFunction(wg sync.WaitGroup) {
+    defer wg.Done()
+    s := make([]string, 3)
+    for i:= 0; i < 10000000; i++{
+        alpha()
+        beta()
+        delta()
+        gamma()
+        s = append(s, "magical pandas")
+        if (i % 100000) == 0 {
+            time.Sleep(50 * time.Millisecond)
+        }
+    }
+}

sample/programs/go/simple.go

@@ -0,0 +1,53 @@
+package main
+
+import "flag"
+import "runtime/pprof"
+import "os"
+
+var cpuprofile = flag.String("cpuprofile", "", "write cpu profile to file")
+
+func alpha() {
+	z := 3
+	for i := 0; i < 100000; i++ {
+		z *= 3
+	}
+}
+
+func beta() {
+	z := 3
+	for i := 0; i < 100000; i++ {
+		z *= 3
+	}
+}
+
+func delta() {
+	z := 3
+	for i := 0; i < 100000; i++ {
+		z *= 3
+	}
+	alpha()
+	beta()
+}
+
+func gamma() {
+	z := 3
+	for i := 0; i < 100000; i++ {
+		z *= 3
+	}
+}
+
+func main() {
+	flag.Parse()
+	if *cpuprofile != "" {
+		f, _ := os.Create(*cpuprofile)
+		pprof.StartCPUProfile(f)
+		defer pprof.StopCPUProfile()
+	}
+
+	for i := 0; i < 10000; i++ {
+		alpha()
+		beta()
+		delta()
+		gamma()
+	}
+}

sample/programs/javascript/convertToOld.js

@@ -0,0 +1,60 @@
+/*
+* This script is used to reconstruct an cpu profile from chrome with an old format
+* still used in nodejs with v8-profiler
+*/
+const fs = require('fs')
+
+const data = JSON.parse(fs.readFileSync('../../profiles/Chrome/65/simple.cpuprofile').toString())
+
+const _convertTimeDeltas = (profile) => {
+  if (!profile.timeDeltas) return null
+  let lastTimeUsec = profile.startTime
+  const timestamps = new Array(profile.timeDeltas.length + 1)
+  for (let i = 0; i < profile.timeDeltas.length; ++i) {
+    timestamps[i] = lastTimeUsec
+    lastTimeUsec += profile.timeDeltas[i]
+  }
+  timestamps[profile.timeDeltas.length] = lastTimeUsec
+  return timestamps
+}
+
+const reformatNode = node => {
+  if (!node.children) node.children = []
+
+  node.children = node.children.map(childID => {
+    if (typeof childID !== 'number') return childID
+    const childNode = data.nodes.find(node => node.id === childID)
+    if (typeof childNode !== 'object') return null
+    childNode.callUID = node.id
+    return childNode
+  })
+  return {
+    functionName: node.callFrame.functionName,
+    url: node.callFrame.url,
+    lineNumber: node.callFrame.lineNumber,
+    callUID: node.callUID,
+    bailoutReason: '',
+    id: node.id,
+    scriptId: 0,
+    hitCount: node.hitCount,
+    children: node.children.map(reformatNode)
+  }
+}
+
+// reformat then only keep the root as top level node
+const nodes = data.nodes
+  .map(reformatNode)
+  .filter(node => node.functionName === '(root)')[0]
+
+// since it can be undefined, create an array so execution still works
+if (!data.timeDeltas) {
+  data.timeDeltas = []
+}
+
+fs.writeFileSync('./new.cpuprofile', JSON.stringify({
+  head: nodes,
+  startTime: Math.floor(data.startTime / 1000000),
+  endTime: Math.floor(data.endTime / 1000000),
+  samples: data.samples,
+  timestamps: _convertTimeDeltas(data)
+}))

sample/programs/javascript/simple.js

@@ -25,8 +25,4 @@ function gamma() {
   return prod
 }
 
-console.profile('simple')
 alpha()
-setTimeout(() => {
-  console.profileEnd('simple')
-}, 0)

sample/programs/javascript/worker.html

@@ -0,0 +1,28 @@
+<script>
+  function banana() {
+    let prod = 1
+    for (let i = 1; i < 1000; i++) {
+      prod *= i
+    }
+    return prod
+  }
+
+  function apple() {
+    for (let i = 0; i < 1000; i++) {
+      banana()
+    }
+  }
+
+  let bounces = 0
+
+  const worker = new Worker('./worker.js')
+
+  worker.onmessage = function() {
+    apple()
+    if (bounces++ < 10) {
+      worker.postMessage('ping')
+    }
+  }
+
+  worker.postMessage('ping')
+</script>

sample/programs/javascript/worker.js

@@ -0,0 +1,18 @@
+function gamma() {
+  let prod = 1
+  for (let i = 1; i < 1000; i++) {
+    prod *= i
+  }
+  return prod
+}
+
+function alpha() {
+  for (let i = 0; i < 1000; i++) {
+    gamma()
+  }
+}
+
+onmessage = function(e) {
+  alpha()
+  postMessage('pong')
+}

scripts/build-release.sh

@@ -7,6 +7,9 @@ OUTDIR=`pwd`/dist/release
 # Typecheck
 node_modules/.bin/tsc --noEmit
 
+# Run unit tests
+npm run jest
+
 # Clean out the release directory
 rm -rf "$OUTDIR"
 mkdir -p "$OUTDIR"

scripts/ci.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+set -euxo pipefail
+
+npm run typecheck
+npm run lint
+npm run coverage
+node scripts/generate-file-format-schema-json.js > /dev/null

scripts/deploy.sh

@@ -1,26 +1,28 @@
 #!/bin/bash
 #
-# type check, do a release build, then do a shallow clone of the
-# repository into a temporary directory and copy the release build
-# artifacts into there to commit & push to the gh-pages branch
+# Do a shallow clone of the repository into a temporary directory and copy the
+# artifacts pulled from npm into the shallow clone to commit & push to the
+# gh-pages branch.
 
 set -euxo pipefail
 
-OUTDIR=`pwd`/dist/release
-echo $OUTDIR
+SRCDIR=`pwd`
+OUTDIR=`mktemp -d -t speedscope-unpacked`
 
-./scripts/build-release.sh
+# Untar the package
+pushd "$OUTDIR"
+PACKEDNAME=`npm pack speedscope | tail -n1`
+tar -xvvf "$PACKEDNAME"
 
 # Create a shallow clone of the repository
-TMPDIR=`mktemp -d -t speedscope-release`
-echo "Entering $TMPDIR"
+TMPDIR=`mktemp -d -t speedscope-deploy`
 pushd "$TMPDIR"
 git clone --depth 1 git@github.com:jlfwong/speedscope.git -b gh-pages
 
 # Copy the build artifacts into the shallow clone
 pushd speedscope
 rm -rf *
-cp -R "$OUTDIR"/* .
+cp -R "$OUTDIR"/package/dist/release/** .
 
 # Set the CNAME record
 echo www.speedscope.app > CNAME
@@ -35,17 +37,14 @@ function ctrl_c() {
   if [[ $REPLY =~ ^yes$ ]]
   then
     git add --all
-    git commit -m 'Release'
+    git commit -m "Deploy $PACKEDNAME"
     git push origin HEAD:gh-pages
-    popd
     rm -rf "$TMPDIR"
     exit 0
   else
     set +x
     echo "Aborting release."
     set -x
-
-    popd
     rm -rf "$TMPDIR"
     exit 1
   fi

scripts/generate-file-format-schema-json.js

@@ -3,7 +3,7 @@ const child_process = require('child_process')
 
 // Convert the file-format-spec.ts file into a json schema file
 let jsonSchema = child_process.execSync(
-  'node_modules/.bin/quicktype --lang schema ./src/lib/file-format-spec.ts',
+  'node_modules/.bin/typescript-json-schema ./src/lib/file-format-spec.ts --titles --required --topRef "*"',
   {
     encoding: 'utf8',
   },

scripts/prepare-zip-file.sh

@@ -0,0 +1,34 @@
+#!/bin/bash
+
+# Create a zip file containing a standalone copy of speedscope
+# based on the contents of the package published to npm
+
+set -euxo pipefail
+
+SRCDIR=`pwd`
+TMPDIR=`mktemp -d -t speedscope-test-installation`
+
+# Untar the package
+pushd "$TMPDIR"
+PACKEDNAME=`npm pack speedscope | tail -n1`
+tar -xvvf "$PACKEDNAME"
+
+# Zip the parts we care about
+ZIPNAME=`basename $PACKEDNAME .tgz`.zip
+mkdir speedscope
+mv package/dist/release/** speedscope
+cp "$SRCDIR"/LICENSE speedscope
+echo "This is a self-contained release of https://github.com/jlfwong/speedscope." > speedscope/README
+echo "To use it, open index.html in Chrome or Firefox." >> speedscope/README
+
+zip "$ZIPNAME" speedscope/**
+
+# Switch back to the repository root
+popd
+mv "$TMPDIR"/"$ZIPNAME" dist/release/"$ZIPNAME"
+
+# Clean up
+rm -rf "$TMPDIR"
+
+set +x
+echo "Created dist/release/$ZIPNAME"

src/README.md

@@ -0,0 +1,13 @@
+# Speedscope TypeScript source
+
+This directory contains the bulk of speedscope's source code.
+
+## Subdirectories
+
+* `gl/`: WebGL code. This includes e.g. the code to render flamecharts.
+* `import/`: Code to import profiles from varous profilers into speedscope. This include e.g. the code to import Chrome performance profiles.
+* `lib/`: Mostly dependency-less utilities. This includes e.g. an LRU cache implementation, basic linear algebra classes,
+  and the definition of speedscope's file format.
+* `store/`: Speedscope's application state management. Implemented using [`redux`](https://redux.js.org/).
+* `typings/`: [TypeScript definition files](https://basarat.gitbooks.io/typescript/docs/types/ambient/d.ts.html)
+* `views/`: View code to generate the HTML & CSS used to construct the UI. Implemented using [`preact`](https://preactjs.com/) and [`aphrodite`](https://github.com/Khan/aphrodite). Also contains code mapping from the `redux` store to views using [`preact-redux`](https://github.com/developit/preact-redux)

src/gl/canvas-context.ts

@@ -24,9 +24,7 @@ export class CanvasContext {
     const webGLInfo = this.gl.getWebGLInfo()
     if (webGLInfo) {
       console.log(
-        `WebGL initialized. renderer: ${webGLInfo.renderer}, vendor: ${
-          webGLInfo.vendor
-        }, version: ${webGLInfo.version}`,
+        `WebGL initialized. renderer: ${webGLInfo.renderer}, vendor: ${webGLInfo.vendor}, version: ${webGLInfo.version}`,
       )
     }
     ;(window as any)['testContextLoss'] = () => {
@@ -49,7 +47,7 @@ export class CanvasContext {
   }
   private onBeforeFrame = () => {
     this.animationFrameRequest = null
-    this.gl.setViewport(0, 0, this.gl.renderTargetWidth, this.gl.renderTargetHeight)
+    this.gl.setViewport(0, 0, this.gl.renderTargetWidthInPixels, this.gl.renderTargetHeightInPixels)
     this.gl.clear(new Graphics.Color(1, 1, 1, 1))
 
     for (const handler of this.beforeFrameHandlers) {

src/gl/flamechart-renderer.ts

@@ -175,8 +175,8 @@ export class FlamechartRenderer {
         // and the blue channel to indicate the color bucket to render.
         // We add one to each so we have zero reserved for the background color.
         const color = new Color(
-          (1 + i % 255) / 256,
-          (1 + stackDepth % 255) / 256,
+          (1 + (i % 255)) / 256,
+          (1 + (stackDepth % 255)) / 256,
           (1 + this.flamechart.getColorBucketForFrame(frame.node.frame)) / 256,
         )
         batch.addRect(configSpaceBounds, color)
@@ -288,10 +288,10 @@ export class FlamechartRenderer {
     const configSpaceContentWidth = this.flamechart.getTotalWeight()
     const numAtlasEntriesPerLayer = Math.pow(2, zoomLevel)
     const left = Math.floor(
-      numAtlasEntriesPerLayer * configSpaceSrcRect.left() / configSpaceContentWidth,
+      (numAtlasEntriesPerLayer * configSpaceSrcRect.left()) / configSpaceContentWidth,
     )
     const right = Math.ceil(
-      numAtlasEntriesPerLayer * configSpaceSrcRect.right() / configSpaceContentWidth,
+      (numAtlasEntriesPerLayer * configSpaceSrcRect.right()) / configSpaceContentWidth,
     )
 
     const nLayers = this.flamechart.getLayers().length
@@ -337,6 +337,8 @@ export class FlamechartRenderer {
     )
 
     renderInto(this.gl, renderTarget, () => {
+      this.gl.clear(new Graphics.Color(0, 0, 0, 0))
+
       const viewportRect = new Rect(
         Vec2.zero,
         new Vec2(this.gl.viewport.width, this.gl.viewport.height),

src/gl/graphics.ts

@@ -141,11 +141,11 @@ export namespace Graphics {
     abstract setRenderTarget(renderTarget: RenderTarget | null): void
     abstract setViewport(x: number, y: number, width: number, height: number): void
     abstract viewport: Rect
-    abstract width: number
-    abstract height: number
+    abstract widthInPixels: number
+    abstract heightInPixels: number
 
-    abstract renderTargetHeight: number
-    abstract renderTargetWidth: number
+    abstract renderTargetHeightInPixels: number
+    abstract renderTargetWidthInPixels: number
 
     abstract setBlendState(source: BlendOperation, target: BlendOperation): void
     setCopyBlendState() {
@@ -304,10 +304,10 @@ export namespace WebGL {
     private _oldViewport = new Graphics.Rect()
     private _width = 0
 
-    get width() {
+    get widthInPixels() {
       return this._width
     }
-    get height() {
+    get heightInPixels() {
       return this._height
     }
 
@@ -411,13 +411,13 @@ export namespace WebGL {
         : this._defaultViewport
     }
 
-    get renderTargetWidth() {
+    get renderTargetWidthInPixels() {
       return this._currentRenderTarget != null
         ? this._currentRenderTarget.viewport.width
         : this._width
     }
 
-    get renderTargetHeight() {
+    get renderTargetHeightInPixels() {
       return this._currentRenderTarget != null
         ? this._currentRenderTarget.viewport.height
         : this._height
@@ -455,7 +455,19 @@ export namespace WebGL {
       widthInAppUnits: number,
       heightInAppUnits: number,
     ) {
-      let canvas = this._gl.canvas
+      let canvas = this._gl.canvas as HTMLCanvasElement
+      const bounds = canvas.getBoundingClientRect()
+
+      if (
+        this._width === widthInAppUnits &&
+        this._height === heightInPixels &&
+        bounds.width === widthInAppUnits &&
+        bounds.height === heightInAppUnits
+      ) {
+        // Nothing to do here!
+        return
+      }
+
       let style = canvas.style
       canvas.width = widthInPixels
       canvas.height = heightInPixels
@@ -547,7 +559,7 @@ export namespace WebGL {
       if (this._forceStateUpdate || !this._oldViewport.equals(viewport)) {
         gl.viewport(
           viewport.x,
-          this.renderTargetHeight - viewport.y - viewport.height,
+          this.renderTargetHeightInPixels - viewport.y - viewport.height,
           viewport.width,
           viewport.height,
         )
@@ -1074,11 +1086,17 @@ export namespace WebGL {
 
     _compileShader(gl: WebGLRenderingContext, type: GLenum, source: string) {
       let shader = gl.createShader(type)
+      if (!shader) {
+        throw new Error('Failed to create shader')
+      }
       gl.shaderSource(shader, source)
       gl.compileShader(shader)
       if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
         throw new Error(`${gl.getShaderInfoLog(shader)}`)
       }
+      if (!this._program) {
+        throw new Error('Tried to attach shader before program was created')
+      }
       gl.attachShader(this._program, shader)
     }
 

src/gl/overlay-rectangle-renderer.ts

@@ -65,7 +65,12 @@ export class ViewportRectangleRenderer {
   private buffer: Graphics.VertexBuffer
 
   constructor(private gl: Graphics.Context) {
-    const vertices = [[-1, 1], [1, 1], [-1, -1], [1, -1]]
+    const vertices = [
+      [-1, 1],
+      [1, 1],
+      [-1, -1],
+      [1, -1],
+    ]
     const floats: number[] = []
     for (let v of vertices) {
       floats.push(v[0])
@@ -92,7 +97,7 @@ export class ViewportRectangleRenderer {
     this.material.setUniformVec2('physicalOrigin', viewport.x, viewport.y)
     this.material.setUniformVec2('physicalSize', viewport.width, viewport.height)
 
-    this.material.setUniformFloat('framebufferHeight', this.gl.renderTargetHeight)
+    this.material.setUniformFloat('framebufferHeight', this.gl.renderTargetHeightInPixels)
 
     this.gl.setBlendState(
       Graphics.BlendOperation.SOURCE_ALPHA,

src/gl/rectangle-batch-renderer.ts

@@ -45,7 +45,14 @@ export class RectangleBatch {
       return this.buffer
     }
 
-    const corners = [[0, 0], [1, 0], [0, 1], [1, 0], [0, 1], [1, 1]]
+    const corners = [
+      [0, 0],
+      [1, 0],
+      [0, 1],
+      [1, 0],
+      [0, 1],
+      [1, 1],
+    ]
 
     const bytes = new Uint8Array(vertexFormat.stride * corners.length * this.rects.length)
     const floats = new Float32Array(bytes.buffer)

src/import/__snapshots__/bg-flamegraph.test.ts.snap

@@ -50,6 +50,168 @@ Object {
 }
 `;
 
+exports[`importFromBGFlameGraph with CRLF 1`] = `
+Object {
+  "frames": Array [
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": "a",
+      "line": undefined,
+      "name": "a",
+      "selfWeight": 0,
+      "totalWeight": 14,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": "b",
+      "line": undefined,
+      "name": "b",
+      "selfWeight": 5,
+      "totalWeight": 14,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": "c",
+      "line": undefined,
+      "name": "c",
+      "selfWeight": 5,
+      "totalWeight": 5,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": "d",
+      "line": undefined,
+      "name": "d",
+      "selfWeight": 4,
+      "totalWeight": 4,
+    },
+  ],
+  "name": "simple-crlf.txt",
+  "stacks": Array [
+    "a;b;c 2",
+    "a;b;d 4",
+    "a;b;c 3",
+    "a;b 5",
+  ],
+}
+`;
+
+exports[`importFromBGFlameGraph with CRLF: indexToView 1`] = `0`;
+
+exports[`importFromBGFlameGraph with CRLF: profileGroup.name 1`] = `"simple-crlf.txt"`;
+
+exports[`importFromBGFlameGraph with UTF-16, Big Endian 1`] = `
+Object {
+  "frames": Array [
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": "a",
+      "line": undefined,
+      "name": "a",
+      "selfWeight": 0,
+      "totalWeight": 14,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": "b",
+      "line": undefined,
+      "name": "b",
+      "selfWeight": 5,
+      "totalWeight": 14,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": "c",
+      "line": undefined,
+      "name": "c",
+      "selfWeight": 5,
+      "totalWeight": 5,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": "d",
+      "line": undefined,
+      "name": "d",
+      "selfWeight": 4,
+      "totalWeight": 4,
+    },
+  ],
+  "name": "simple-utf16-be.txt",
+  "stacks": Array [
+    "a;b;c 2",
+    "a;b;d 4",
+    "a;b;c 3",
+    "a;b 5",
+  ],
+}
+`;
+
+exports[`importFromBGFlameGraph with UTF-16, Big Endian: indexToView 1`] = `0`;
+
+exports[`importFromBGFlameGraph with UTF-16, Big Endian: profileGroup.name 1`] = `"simple-utf16-be.txt"`;
+
+exports[`importFromBGFlameGraph with UTF-16, Little Endian 1`] = `
+Object {
+  "frames": Array [
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": "a",
+      "line": undefined,
+      "name": "a",
+      "selfWeight": 0,
+      "totalWeight": 14,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": "b",
+      "line": undefined,
+      "name": "b",
+      "selfWeight": 5,
+      "totalWeight": 14,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": "c",
+      "line": undefined,
+      "name": "c",
+      "selfWeight": 5,
+      "totalWeight": 5,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": "d",
+      "line": undefined,
+      "name": "d",
+      "selfWeight": 4,
+      "totalWeight": 4,
+    },
+  ],
+  "name": "simple-utf16-le.txt",
+  "stacks": Array [
+    "a;b;c 2",
+    "a;b;d 4",
+    "a;b;c 3",
+    "a;b 5",
+  ],
+}
+`;
+
+exports[`importFromBGFlameGraph with UTF-16, Little Endian: indexToView 1`] = `0`;
+
+exports[`importFromBGFlameGraph with UTF-16, Little Endian: profileGroup.name 1`] = `"simple-utf16-le.txt"`;
+
 exports[`importFromBGFlameGraph: indexToView 1`] = `0`;
 
 exports[`importFromBGFlameGraph: profileGroup.name 1`] = `"simple.txt"`;

src/import/__snapshots__/firefox.test.ts.snap

@@ -42,6 +42,7 @@ Object {
   ],
   "name": "simple-firefox.json",
   "stacks": Array [
+    " 2.04ms",
     "a;b;d 989.53µs",
     "a;c;d 1.02ms",
     "a;b;d 982.04µs",
@@ -59,6 +60,71 @@ Object {
 }
 `;
 
+exports[`importFromFirefox ignore self-hosted 1`] = `
+Object {
+  "frames": Array [
+    Frame {
+      "col": undefined,
+      "file": "http://localhost:8000/simple.js:1",
+      "key": "alpha (http://localhost:8000/simple.js:1:14)",
+      "line": 14,
+      "name": "alpha",
+      "selfWeight": 0,
+      "totalWeight": 26.983816999942064,
+    },
+    Frame {
+      "col": undefined,
+      "file": "http://localhost:8000/simple.js:14",
+      "key": "delta (http://localhost:8000/simple.js:14:14)",
+      "line": 14,
+      "name": "delta",
+      "selfWeight": 0,
+      "totalWeight": 11.946324001066387,
+    },
+    Frame {
+      "col": undefined,
+      "file": "http://localhost:8000/simple.js:20",
+      "key": "gamma (http://localhost:8000/simple.js:20:14)",
+      "line": 14,
+      "name": "gamma",
+      "selfWeight": 26.983816999942064,
+      "totalWeight": 26.983816999942064,
+    },
+    Frame {
+      "col": undefined,
+      "file": "http://localhost:8000/simple.js:8",
+      "key": "beta (http://localhost:8000/simple.js:8:13)",
+      "line": 13,
+      "name": "beta",
+      "selfWeight": 0,
+      "totalWeight": 15.037492998875678,
+    },
+  ],
+  "name": "simple-firefox.json",
+  "stacks": Array [
+    " 4.61ms",
+    "alpha;delta;gamma 999.57µs",
+    "alpha;beta;gamma 2.01ms",
+    "alpha;delta;gamma 1.00ms",
+    "alpha;beta;gamma 995.68µs",
+    "alpha;delta;gamma 996.27µs",
+    "alpha;beta;gamma 4.01ms",
+    "alpha;delta;gamma 2.02ms",
+    "alpha;beta;gamma 959.44µs",
+    "alpha;delta;gamma 2.01ms",
+    "alpha;beta;gamma 4.01ms",
+    "alpha;delta;gamma 959.28µs",
+    "alpha;beta;gamma 2.03ms",
+    "alpha;delta;gamma 3.96ms",
+    "alpha;beta;gamma 1.02ms",
+  ],
+}
+`;
+
+exports[`importFromFirefox ignore self-hosted: indexToView 1`] = `0`;
+
+exports[`importFromFirefox ignore self-hosted: profileGroup.name 1`] = `"simple-firefox.json"`;
+
 exports[`importFromFirefox recursion 1`] = `
 Object {
   "frames": Array [
@@ -110,6 +176,7 @@ Object {
   ],
   "name": "recursion.json",
   "stacks": Array [
+    " 1.71ms",
     "main;alpha;beta;alpha;beta;alpha;beta;alpha;delta;gamma 998.89µs",
     "main 1.19ms",
     "main;alpha;beta;alpha;delta;gamma 1.83ms",

src/import/__snapshots__/haskell.test.ts.snap

@@ -0,0 +1,864 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`importFromHaskell 1`] = `
+Object {
+  "frames": Array [
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": 144,
+      "line": undefined,
+      "name": "MAIN.MAIN",
+      "selfWeight": 0,
+      "totalWeight": 798,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": 56,
+      "line": undefined,
+      "name": "GHC.Conc.Signal.CAF",
+      "selfWeight": 0,
+      "totalWeight": 0,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": 73,
+      "line": undefined,
+      "name": "GHC.IO.Encoding.CAF",
+      "selfWeight": 0,
+      "totalWeight": 0,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": 75,
+      "line": undefined,
+      "name": "GHC.IO.Encoding.Iconv.CAF",
+      "selfWeight": 0,
+      "totalWeight": 0,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": 84,
+      "line": undefined,
+      "name": "GHC.IO.Handle.FD.CAF",
+      "selfWeight": 0,
+      "totalWeight": 0,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": 119,
+      "line": undefined,
+      "name": "Text.Printf.CAF",
+      "selfWeight": 0,
+      "totalWeight": 0,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": 26,
+      "line": undefined,
+      "name": "Main.CAF:eta1_r6nI",
+      "selfWeight": 0,
+      "totalWeight": 1,
+    },
+    Frame {
+      "col": undefined,
+      "file": "src/Main.hs:(21,1)-(38,42)",
+      "key": 19,
+      "line": undefined,
+      "name": "Main.main",
+      "selfWeight": 0,
+      "totalWeight": 733,
+    },
+    Frame {
+      "col": undefined,
+      "file": "src/Main.hs:(56,1)-(57,42)",
+      "key": 4,
+      "line": undefined,
+      "name": "Main.check",
+      "selfWeight": 320,
+      "totalWeight": 320,
+    },
+    Frame {
+      "col": undefined,
+      "file": "src/Main.hs:31:9-29",
+      "key": 16,
+      "line": undefined,
+      "name": "Main.main.long",
+      "selfWeight": 0,
+      "totalWeight": 3,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": 28,
+      "line": undefined,
+      "name": "Main.CAF:eta_r6nG",
+      "selfWeight": 0,
+      "totalWeight": 0,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": 35,
+      "line": undefined,
+      "name": "Main.CAF:io1",
+      "selfWeight": 0,
+      "totalWeight": 0,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": 27,
+      "line": undefined,
+      "name": "Main.CAF:lvl2_r6nH",
+      "selfWeight": 0,
+      "totalWeight": 3,
+    },
+    Frame {
+      "col": undefined,
+      "file": "src/Main.hs:(61,1)-(63,26)",
+      "key": 3,
+      "line": undefined,
+      "name": "Main.make",
+      "selfWeight": 406,
+      "totalWeight": 409,
+    },
+    Frame {
+      "col": undefined,
+      "file": "src/Main.hs:63:19-26",
+      "key": 1,
+      "line": undefined,
+      "name": "Main.make.d2",
+      "selfWeight": 2,
+      "totalWeight": 2,
+    },
+    Frame {
+      "col": undefined,
+      "file": "src/Main.hs:63:9-16",
+      "key": 2,
+      "line": undefined,
+      "name": "Main.make.i2",
+      "selfWeight": 1,
+      "totalWeight": 1,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": 24,
+      "line": undefined,
+      "name": "Main.CAF:lvl4_r6nL",
+      "selfWeight": 0,
+      "totalWeight": 0,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": 22,
+      "line": undefined,
+      "name": "Main.CAF:lvl8_r6nP",
+      "selfWeight": 0,
+      "totalWeight": 0,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": 21,
+      "line": undefined,
+      "name": "Main.CAF:main1",
+      "selfWeight": 0,
+      "totalWeight": 0,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": 29,
+      "line": undefined,
+      "name": "Main.CAF:main11",
+      "selfWeight": 0,
+      "totalWeight": 4,
+    },
+    Frame {
+      "col": undefined,
+      "file": "src/Main.hs:27:9-35",
+      "key": 15,
+      "line": undefined,
+      "name": "Main.main.c",
+      "selfWeight": 0,
+      "totalWeight": 8,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": 30,
+      "line": undefined,
+      "name": "Main.CAF:main12",
+      "selfWeight": 0,
+      "totalWeight": 4,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": 23,
+      "line": undefined,
+      "name": "Main.CAF:main5",
+      "selfWeight": 0,
+      "totalWeight": 0,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": 31,
+      "line": undefined,
+      "name": "Main.CAF:main7",
+      "selfWeight": 0,
+      "totalWeight": 0,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": 25,
+      "line": undefined,
+      "name": "Main.CAF:main9",
+      "selfWeight": 0,
+      "totalWeight": 0,
+    },
+    Frame {
+      "col": undefined,
+      "file": "src/Main.hs:23:9-12",
+      "key": 33,
+      "line": undefined,
+      "name": "Main.CAF:main_maxN",
+      "selfWeight": 0,
+      "totalWeight": 0,
+    },
+    Frame {
+      "col": undefined,
+      "file": "src/Main.hs:23:9-35",
+      "key": 13,
+      "line": undefined,
+      "name": "Main.main.maxN",
+      "selfWeight": 0,
+      "totalWeight": 0,
+    },
+    Frame {
+      "col": undefined,
+      "file": "src/Main.hs:22:9",
+      "key": 34,
+      "line": undefined,
+      "name": "Main.CAF:main_n",
+      "selfWeight": 0,
+      "totalWeight": 0,
+    },
+    Frame {
+      "col": undefined,
+      "file": "src/Main.hs:22:9-14",
+      "key": 12,
+      "line": undefined,
+      "name": "Main.main.n",
+      "selfWeight": 0,
+      "totalWeight": 0,
+    },
+    Frame {
+      "col": undefined,
+      "file": "src/Main.hs:24:9-16",
+      "key": 32,
+      "line": undefined,
+      "name": "Main.CAF:main_stretchN",
+      "selfWeight": 0,
+      "totalWeight": 0,
+    },
+    Frame {
+      "col": undefined,
+      "file": "src/Main.hs:24:9-27",
+      "key": 14,
+      "line": undefined,
+      "name": "Main.main.stretchN",
+      "selfWeight": 0,
+      "totalWeight": 0,
+    },
+    Frame {
+      "col": undefined,
+      "file": "src/Main.hs:17:1-4",
+      "key": 36,
+      "line": undefined,
+      "name": "Main.CAF:minN",
+      "selfWeight": 0,
+      "totalWeight": 0,
+    },
+    Frame {
+      "col": undefined,
+      "file": "src/Main.hs:17:1-8",
+      "key": 9,
+      "line": undefined,
+      "name": "Main.minN",
+      "selfWeight": 0,
+      "totalWeight": 0,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": 146,
+      "line": undefined,
+      "name": "GC.GC",
+      "selfWeight": 46,
+      "totalWeight": 46,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": 147,
+      "line": undefined,
+      "name": "PROFILING.OVERHEAD_of",
+      "selfWeight": 0,
+      "totalWeight": 0,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": 145,
+      "line": undefined,
+      "name": "SYSTEM.SYSTEM",
+      "selfWeight": 19,
+      "totalWeight": 19,
+    },
+    Frame {
+      "col": undefined,
+      "file": "src/Main.hs:35:26-54",
+      "key": 18,
+      "line": undefined,
+      "name": "Main.main.\\\\",
+      "selfWeight": 0,
+      "totalWeight": 0,
+    },
+    Frame {
+      "col": undefined,
+      "file": "src/Main.hs:19:1-56",
+      "key": 8,
+      "line": undefined,
+      "name": "Main.io",
+      "selfWeight": 0,
+      "totalWeight": 0,
+    },
+    Frame {
+      "col": undefined,
+      "file": "src/Main.hs:34:9-28",
+      "key": 17,
+      "line": undefined,
+      "name": "Main.main.vs",
+      "selfWeight": 0,
+      "totalWeight": 721,
+    },
+    Frame {
+      "col": undefined,
+      "file": "src/Main.hs:(42,1)-(45,38)",
+      "key": 11,
+      "line": undefined,
+      "name": "Main.depth",
+      "selfWeight": 0,
+      "totalWeight": 721,
+    },
+    Frame {
+      "col": undefined,
+      "file": "src/Main.hs:(49,1)-(52,31)",
+      "key": 7,
+      "line": undefined,
+      "name": "Main.sumT",
+      "selfWeight": 0,
+      "totalWeight": 721,
+    },
+    Frame {
+      "col": undefined,
+      "file": "src/Main.hs:51:9-31",
+      "key": 6,
+      "line": undefined,
+      "name": "Main.sumT.a",
+      "selfWeight": 3,
+      "totalWeight": 369,
+    },
+    Frame {
+      "col": undefined,
+      "file": "src/Main.hs:52:9-31",
+      "key": 5,
+      "line": undefined,
+      "name": "Main.sumT.b",
+      "selfWeight": 1,
+      "totalWeight": 352,
+    },
+    Frame {
+      "col": undefined,
+      "file": "src/Main.hs:45:9-38",
+      "key": 10,
+      "line": undefined,
+      "name": "Main.depth.n",
+      "selfWeight": 0,
+      "totalWeight": 0,
+    },
+  ],
+  "name": "binary-trees time",
+  "stacks": Array [
+    "MAIN.MAIN;Main.CAF:eta1_r6nI;Main.main;Main.check 1.00ms",
+    "MAIN.MAIN;Main.CAF:lvl2_r6nH;Main.main;Main.main.long;Main.make 3.00ms",
+    "MAIN.MAIN;Main.CAF:main11;Main.main;Main.main.c;Main.check 4.00ms",
+    "MAIN.MAIN;Main.CAF:main12;Main.main;Main.main.c;Main.make 4.00ms",
+    "MAIN.MAIN;GC.GC 46.00ms",
+    "MAIN.MAIN;SYSTEM.SYSTEM 19.00ms",
+    "MAIN.MAIN;Main.main;Main.main.vs;Main.depth;Main.sumT;Main.sumT.a;Main.check 153.00ms",
+    "MAIN.MAIN;Main.main;Main.main.vs;Main.depth;Main.sumT;Main.sumT.a;Main.make;Main.make.d2 2.00ms",
+    "MAIN.MAIN;Main.main;Main.main.vs;Main.depth;Main.sumT;Main.sumT.a;Main.make;Main.make.i2 1.00ms",
+    "MAIN.MAIN;Main.main;Main.main.vs;Main.depth;Main.sumT;Main.sumT.a;Main.make 210.00ms",
+    "MAIN.MAIN;Main.main;Main.main.vs;Main.depth;Main.sumT;Main.sumT.a 3.00ms",
+    "MAIN.MAIN;Main.main;Main.main.vs;Main.depth;Main.sumT;Main.sumT.b;Main.check 162.00ms",
+    "MAIN.MAIN;Main.main;Main.main.vs;Main.depth;Main.sumT;Main.sumT.b;Main.make 189.00ms",
+    "MAIN.MAIN;Main.main;Main.main.vs;Main.depth;Main.sumT;Main.sumT.b 1.00ms",
+  ],
+}
+`;
+
+exports[`importFromHaskell 2`] = `
+Object {
+  "frames": Array [
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": 144,
+      "line": undefined,
+      "name": "MAIN.MAIN",
+      "selfWeight": 648,
+      "totalWeight": 1921672664,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": 56,
+      "line": undefined,
+      "name": "GHC.Conc.Signal.CAF",
+      "selfWeight": 640,
+      "totalWeight": 640,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": 73,
+      "line": undefined,
+      "name": "GHC.IO.Encoding.CAF",
+      "selfWeight": 2768,
+      "totalWeight": 2768,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": 75,
+      "line": undefined,
+      "name": "GHC.IO.Encoding.Iconv.CAF",
+      "selfWeight": 200,
+      "totalWeight": 200,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": 84,
+      "line": undefined,
+      "name": "GHC.IO.Handle.FD.CAF",
+      "selfWeight": 34704,
+      "totalWeight": 34704,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": 119,
+      "line": undefined,
+      "name": "Text.Printf.CAF",
+      "selfWeight": 528,
+      "totalWeight": 528,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": 26,
+      "line": undefined,
+      "name": "Main.CAF:eta1_r6nI",
+      "selfWeight": 0,
+      "totalWeight": 2097152,
+    },
+    Frame {
+      "col": undefined,
+      "file": "src/Main.hs:(21,1)-(38,42)",
+      "key": 19,
+      "line": undefined,
+      "name": "Main.main",
+      "selfWeight": 32,
+      "totalWeight": 1921591544,
+    },
+    Frame {
+      "col": undefined,
+      "file": "src/Main.hs:(56,1)-(57,42)",
+      "key": 4,
+      "line": undefined,
+      "name": "Main.check",
+      "selfWeight": 406149056,
+      "totalWeight": 406149056,
+    },
+    Frame {
+      "col": undefined,
+      "file": "src/Main.hs:31:9-29",
+      "key": 16,
+      "line": undefined,
+      "name": "Main.main.long",
+      "selfWeight": 32,
+      "totalWeight": 7864112,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": 28,
+      "line": undefined,
+      "name": "Main.CAF:eta_r6nG",
+      "selfWeight": 1096,
+      "totalWeight": 1096,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": 35,
+      "line": undefined,
+      "name": "Main.CAF:io1",
+      "selfWeight": 1888,
+      "totalWeight": 1888,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": 27,
+      "line": undefined,
+      "name": "Main.CAF:lvl2_r6nH",
+      "selfWeight": 0,
+      "totalWeight": 7864112,
+    },
+    Frame {
+      "col": undefined,
+      "file": "src/Main.hs:(61,1)-(63,26)",
+      "key": 3,
+      "line": undefined,
+      "name": "Main.make",
+      "selfWeight": 1512575520,
+      "totalWeight": 1512575520,
+    },
+    Frame {
+      "col": undefined,
+      "file": "src/Main.hs:63:19-26",
+      "key": 1,
+      "line": undefined,
+      "name": "Main.make.d2",
+      "selfWeight": 0,
+      "totalWeight": 0,
+    },
+    Frame {
+      "col": undefined,
+      "file": "src/Main.hs:63:9-16",
+      "key": 2,
+      "line": undefined,
+      "name": "Main.make.i2",
+      "selfWeight": 0,
+      "totalWeight": 0,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": 24,
+      "line": undefined,
+      "name": "Main.CAF:lvl4_r6nL",
+      "selfWeight": 0,
+      "totalWeight": 0,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": 22,
+      "line": undefined,
+      "name": "Main.CAF:lvl8_r6nP",
+      "selfWeight": 520,
+      "totalWeight": 520,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": 21,
+      "line": undefined,
+      "name": "Main.CAF:main1",
+      "selfWeight": 16,
+      "totalWeight": 16,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": 29,
+      "line": undefined,
+      "name": "Main.CAF:main11",
+      "selfWeight": 0,
+      "totalWeight": 4194304,
+    },
+    Frame {
+      "col": undefined,
+      "file": "src/Main.hs:27:9-35",
+      "key": 15,
+      "line": undefined,
+      "name": "Main.main.c",
+      "selfWeight": 64,
+      "totalWeight": 19922736,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": 30,
+      "line": undefined,
+      "name": "Main.CAF:main12",
+      "selfWeight": 0,
+      "totalWeight": 15728432,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": 23,
+      "line": undefined,
+      "name": "Main.CAF:main5",
+      "selfWeight": 0,
+      "totalWeight": 0,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": 31,
+      "line": undefined,
+      "name": "Main.CAF:main7",
+      "selfWeight": 880,
+      "totalWeight": 880,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": 25,
+      "line": undefined,
+      "name": "Main.CAF:main9",
+      "selfWeight": 0,
+      "totalWeight": 0,
+    },
+    Frame {
+      "col": undefined,
+      "file": "src/Main.hs:23:9-12",
+      "key": 33,
+      "line": undefined,
+      "name": "Main.CAF:main_maxN",
+      "selfWeight": 0,
+      "totalWeight": 32,
+    },
+    Frame {
+      "col": undefined,
+      "file": "src/Main.hs:23:9-35",
+      "key": 13,
+      "line": undefined,
+      "name": "Main.main.maxN",
+      "selfWeight": 32,
+      "totalWeight": 32,
+    },
+    Frame {
+      "col": undefined,
+      "file": "src/Main.hs:22:9",
+      "key": 34,
+      "line": undefined,
+      "name": "Main.CAF:main_n",
+      "selfWeight": 0,
+      "totalWeight": 0,
+    },
+    Frame {
+      "col": undefined,
+      "file": "src/Main.hs:22:9-14",
+      "key": 12,
+      "line": undefined,
+      "name": "Main.main.n",
+      "selfWeight": 0,
+      "totalWeight": 0,
+    },
+    Frame {
+      "col": undefined,
+      "file": "src/Main.hs:24:9-16",
+      "key": 32,
+      "line": undefined,
+      "name": "Main.CAF:main_stretchN",
+      "selfWeight": 0,
+      "totalWeight": 32,
+    },
+    Frame {
+      "col": undefined,
+      "file": "src/Main.hs:24:9-27",
+      "key": 14,
+      "line": undefined,
+      "name": "Main.main.stretchN",
+      "selfWeight": 32,
+      "totalWeight": 32,
+    },
+    Frame {
+      "col": undefined,
+      "file": "src/Main.hs:17:1-4",
+      "key": 36,
+      "line": undefined,
+      "name": "Main.CAF:minN",
+      "selfWeight": 0,
+      "totalWeight": 0,
+    },
+    Frame {
+      "col": undefined,
+      "file": "src/Main.hs:17:1-8",
+      "key": 9,
+      "line": undefined,
+      "name": "Main.minN",
+      "selfWeight": 0,
+      "totalWeight": 0,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": 146,
+      "line": undefined,
+      "name": "GC.GC",
+      "selfWeight": 0,
+      "totalWeight": 0,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": 147,
+      "line": undefined,
+      "name": "PROFILING.OVERHEAD_of",
+      "selfWeight": 2496,
+      "totalWeight": 2496,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": 145,
+      "line": undefined,
+      "name": "SYSTEM.SYSTEM",
+      "selfWeight": 34736,
+      "totalWeight": 34736,
+    },
+    Frame {
+      "col": undefined,
+      "file": "src/Main.hs:35:26-54",
+      "key": 18,
+      "line": undefined,
+      "name": "Main.main.\\\\",
+      "selfWeight": 2224,
+      "totalWeight": 46672,
+    },
+    Frame {
+      "col": undefined,
+      "file": "src/Main.hs:19:1-56",
+      "key": 8,
+      "line": undefined,
+      "name": "Main.io",
+      "selfWeight": 67912,
+      "totalWeight": 67912,
+    },
+    Frame {
+      "col": undefined,
+      "file": "src/Main.hs:34:9-28",
+      "key": 17,
+      "line": undefined,
+      "name": "Main.main.vs",
+      "selfWeight": 0,
+      "totalWeight": 1891637344,
+    },
+    Frame {
+      "col": undefined,
+      "file": "src/Main.hs:(42,1)-(45,38)",
+      "key": 11,
+      "line": undefined,
+      "name": "Main.depth",
+      "selfWeight": 1120,
+      "totalWeight": 1891637344,
+    },
+    Frame {
+      "col": undefined,
+      "file": "src/Main.hs:(49,1)-(52,31)",
+      "key": 7,
+      "line": undefined,
+      "name": "Main.sumT",
+      "selfWeight": 0,
+      "totalWeight": 1891636224,
+    },
+    Frame {
+      "col": undefined,
+      "file": "src/Main.hs:51:9-31",
+      "key": 6,
+      "line": undefined,
+      "name": "Main.sumT.a",
+      "selfWeight": 1397760,
+      "totalWeight": 945818112,
+    },
+    Frame {
+      "col": undefined,
+      "file": "src/Main.hs:52:9-31",
+      "key": 5,
+      "line": undefined,
+      "name": "Main.sumT.b",
+      "selfWeight": 1397760,
+      "totalWeight": 945818112,
+    },
+    Frame {
+      "col": undefined,
+      "file": "src/Main.hs:45:9-38",
+      "key": 10,
+      "line": undefined,
+      "name": "Main.depth.n",
+      "selfWeight": 0,
+      "totalWeight": 0,
+    },
+  ],
+  "name": "binary-trees allocation",
+  "stacks": Array [
+    "MAIN.MAIN;GHC.Conc.Signal.CAF 640 B",
+    "MAIN.MAIN;GHC.IO.Encoding.CAF 2.70 KB",
+    "MAIN.MAIN;GHC.IO.Encoding.Iconv.CAF 200 B",
+    "MAIN.MAIN;GHC.IO.Handle.FD.CAF 33.89 KB",
+    "MAIN.MAIN;Text.Printf.CAF 528 B",
+    "MAIN.MAIN;Main.CAF:eta1_r6nI;Main.main;Main.check 2.00 MB",
+    "MAIN.MAIN;Main.CAF:eta1_r6nI;Main.main 32 B",
+    "MAIN.MAIN;Main.CAF:eta_r6nG 1.07 KB",
+    "MAIN.MAIN;Main.CAF:io1 1.84 KB",
+    "MAIN.MAIN;Main.CAF:lvl2_r6nH;Main.main;Main.main.long;Main.make 7.50 MB",
+    "MAIN.MAIN;Main.CAF:lvl2_r6nH;Main.main;Main.main.long 32 B",
+    "MAIN.MAIN;Main.CAF:lvl8_r6nP 520 B",
+    "MAIN.MAIN;Main.CAF:main1 16 B",
+    "MAIN.MAIN;Main.CAF:main11;Main.main;Main.main.c;Main.check 4.00 MB",
+    "MAIN.MAIN;Main.CAF:main11;Main.main;Main.main.c 32 B",
+    "MAIN.MAIN;Main.CAF:main12;Main.main;Main.main.c;Main.make 15.00 MB",
+    "MAIN.MAIN;Main.CAF:main12;Main.main;Main.main.c 32 B",
+    "MAIN.MAIN;Main.CAF:main7 880 B",
+    "MAIN.MAIN;Main.CAF:main_maxN;Main.main;Main.main.maxN 32 B",
+    "MAIN.MAIN;Main.CAF:main_stretchN;Main.main;Main.main.stretchN 32 B",
+    "MAIN.MAIN;PROFILING.OVERHEAD_of 2.44 KB",
+    "MAIN.MAIN;SYSTEM.SYSTEM 33.92 KB",
+    "MAIN.MAIN;Main.main;Main.main.\\\\;Main.io 43.41 KB",
+    "MAIN.MAIN;Main.main;Main.main.\\\\ 2.17 KB",
+    "MAIN.MAIN;Main.main;Main.io 22.91 KB",
+    "MAIN.MAIN;Main.main;Main.main.vs;Main.depth;Main.sumT;Main.sumT.a;Main.check 190.67 MB",
+    "MAIN.MAIN;Main.main;Main.main.vs;Main.depth;Main.sumT;Main.sumT.a;Main.make 710.00 MB",
+    "MAIN.MAIN;Main.main;Main.main.vs;Main.depth;Main.sumT;Main.sumT.a 1.33 MB",
+    "MAIN.MAIN;Main.main;Main.main.vs;Main.depth;Main.sumT;Main.sumT.b;Main.check 190.67 MB",
+    "MAIN.MAIN;Main.main;Main.main.vs;Main.depth;Main.sumT;Main.sumT.b;Main.make 710.00 MB",
+    "MAIN.MAIN;Main.main;Main.main.vs;Main.depth;Main.sumT;Main.sumT.b 1.33 MB",
+    "MAIN.MAIN;Main.main;Main.main.vs;Main.depth 1.09 KB",
+    "MAIN.MAIN 648 B",
+  ],
+}
+`;
+
+exports[`importFromHaskell: indexToView 1`] = `0`;
+
+exports[`importFromHaskell: profileGroup.name 1`] = `"binary-trees"`;

src/import/__snapshots__/pprof.test.ts.snap

@@ -0,0 +1,249 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`importAsPprofProfile 1`] = `
+Object {
+  "frames": Array [
+    Frame {
+      "col": undefined,
+      "file": "/usr/local/Cellar/go/1.10.1/libexec/src/runtime/proc.go",
+      "key": "runtime.main:/usr/local/Cellar/go/1.10.1/libexec/src/runtime/proc.go:0",
+      "line": 0,
+      "name": "runtime.main",
+      "selfWeight": 0,
+      "totalWeight": 136,
+    },
+    Frame {
+      "col": undefined,
+      "file": "/Users/jlfwong/code/speedscope/sample/programs/go/simple.go",
+      "key": "main.main:/Users/jlfwong/code/speedscope/sample/programs/go/simple.go:0",
+      "line": 0,
+      "name": "main.main",
+      "selfWeight": 0,
+      "totalWeight": 136,
+    },
+    Frame {
+      "col": undefined,
+      "file": "/Users/jlfwong/code/speedscope/sample/programs/go/simple.go",
+      "key": "main.delta:/Users/jlfwong/code/speedscope/sample/programs/go/simple.go:0",
+      "line": 0,
+      "name": "main.delta",
+      "selfWeight": 22,
+      "totalWeight": 58,
+    },
+    Frame {
+      "col": undefined,
+      "file": "/Users/jlfwong/code/speedscope/sample/programs/go/simple.go",
+      "key": "main.beta:/Users/jlfwong/code/speedscope/sample/programs/go/simple.go:0",
+      "line": 0,
+      "name": "main.beta",
+      "selfWeight": 39,
+      "totalWeight": 39,
+    },
+    Frame {
+      "col": undefined,
+      "file": "/Users/jlfwong/code/speedscope/sample/programs/go/simple.go",
+      "key": "main.alpha:/Users/jlfwong/code/speedscope/sample/programs/go/simple.go:0",
+      "line": 0,
+      "name": "main.alpha",
+      "selfWeight": 48,
+      "totalWeight": 48,
+    },
+    Frame {
+      "col": undefined,
+      "file": "/Users/jlfwong/code/speedscope/sample/programs/go/simple.go",
+      "key": "main.gamma:/Users/jlfwong/code/speedscope/sample/programs/go/simple.go:0",
+      "line": 0,
+      "name": "main.gamma",
+      "selfWeight": 27,
+      "totalWeight": 27,
+    },
+    Frame {
+      "col": undefined,
+      "file": "/usr/local/Cellar/go/1.10.1/libexec/src/runtime/asm_amd64.s",
+      "key": "runtime.morestack:/usr/local/Cellar/go/1.10.1/libexec/src/runtime/asm_amd64.s:0",
+      "line": 0,
+      "name": "runtime.morestack",
+      "selfWeight": 0,
+      "totalWeight": 11,
+    },
+    Frame {
+      "col": undefined,
+      "file": "/usr/local/Cellar/go/1.10.1/libexec/src/runtime/stack.go",
+      "key": "runtime.newstack:/usr/local/Cellar/go/1.10.1/libexec/src/runtime/stack.go:0",
+      "line": 0,
+      "name": "runtime.newstack",
+      "selfWeight": 0,
+      "totalWeight": 11,
+    },
+    Frame {
+      "col": undefined,
+      "file": "/usr/local/Cellar/go/1.10.1/libexec/src/runtime/duff_amd64.s",
+      "key": "runtime.duffcopy:/usr/local/Cellar/go/1.10.1/libexec/src/runtime/duff_amd64.s:0",
+      "line": 0,
+      "name": "runtime.duffcopy",
+      "selfWeight": 11,
+      "totalWeight": 11,
+    },
+    Frame {
+      "col": undefined,
+      "file": "/usr/local/Cellar/go/1.10.1/libexec/src/runtime/time.go",
+      "key": "runtime.timerproc:/usr/local/Cellar/go/1.10.1/libexec/src/runtime/time.go:0",
+      "line": 0,
+      "name": "runtime.timerproc",
+      "selfWeight": 0,
+      "totalWeight": 1,
+    },
+    Frame {
+      "col": undefined,
+      "file": "/usr/local/Cellar/go/1.10.1/libexec/src/runtime/time.go",
+      "key": "runtime.goroutineReady:/usr/local/Cellar/go/1.10.1/libexec/src/runtime/time.go:0",
+      "line": 0,
+      "name": "runtime.goroutineReady",
+      "selfWeight": 0,
+      "totalWeight": 1,
+    },
+    Frame {
+      "col": undefined,
+      "file": "/usr/local/Cellar/go/1.10.1/libexec/src/runtime/proc.go",
+      "key": "runtime.goready:/usr/local/Cellar/go/1.10.1/libexec/src/runtime/proc.go:0",
+      "line": 0,
+      "name": "runtime.goready",
+      "selfWeight": 0,
+      "totalWeight": 1,
+    },
+    Frame {
+      "col": undefined,
+      "file": "/usr/local/Cellar/go/1.10.1/libexec/src/runtime/asm_amd64.s",
+      "key": "runtime.systemstack:/usr/local/Cellar/go/1.10.1/libexec/src/runtime/asm_amd64.s:0",
+      "line": 0,
+      "name": "runtime.systemstack",
+      "selfWeight": 0,
+      "totalWeight": 1,
+    },
+    Frame {
+      "col": undefined,
+      "file": "/usr/local/Cellar/go/1.10.1/libexec/src/runtime/proc.go",
+      "key": "runtime.goready.func1:/usr/local/Cellar/go/1.10.1/libexec/src/runtime/proc.go:0",
+      "line": 0,
+      "name": "runtime.goready.func1",
+      "selfWeight": 0,
+      "totalWeight": 1,
+    },
+    Frame {
+      "col": undefined,
+      "file": "/usr/local/Cellar/go/1.10.1/libexec/src/runtime/proc.go",
+      "key": "runtime.ready:/usr/local/Cellar/go/1.10.1/libexec/src/runtime/proc.go:0",
+      "line": 0,
+      "name": "runtime.ready",
+      "selfWeight": 0,
+      "totalWeight": 1,
+    },
+    Frame {
+      "col": undefined,
+      "file": "/usr/local/Cellar/go/1.10.1/libexec/src/runtime/proc.go",
+      "key": "runtime.wakep:/usr/local/Cellar/go/1.10.1/libexec/src/runtime/proc.go:0",
+      "line": 0,
+      "name": "runtime.wakep",
+      "selfWeight": 0,
+      "totalWeight": 1,
+    },
+    Frame {
+      "col": undefined,
+      "file": "/usr/local/Cellar/go/1.10.1/libexec/src/runtime/proc.go",
+      "key": "runtime.startm:/usr/local/Cellar/go/1.10.1/libexec/src/runtime/proc.go:0",
+      "line": 0,
+      "name": "runtime.startm",
+      "selfWeight": 0,
+      "totalWeight": 1,
+    },
+    Frame {
+      "col": undefined,
+      "file": "/usr/local/Cellar/go/1.10.1/libexec/src/runtime/lock_sema.go",
+      "key": "runtime.notewakeup:/usr/local/Cellar/go/1.10.1/libexec/src/runtime/lock_sema.go:0",
+      "line": 0,
+      "name": "runtime.notewakeup",
+      "selfWeight": 0,
+      "totalWeight": 1,
+    },
+    Frame {
+      "col": undefined,
+      "file": "/usr/local/Cellar/go/1.10.1/libexec/src/runtime/os_darwin.go",
+      "key": "runtime.semawakeup:/usr/local/Cellar/go/1.10.1/libexec/src/runtime/os_darwin.go:0",
+      "line": 0,
+      "name": "runtime.semawakeup",
+      "selfWeight": 0,
+      "totalWeight": 1,
+    },
+    Frame {
+      "col": undefined,
+      "file": "/usr/local/Cellar/go/1.10.1/libexec/src/runtime/os_darwin.go",
+      "key": "runtime.mach_semrelease:/usr/local/Cellar/go/1.10.1/libexec/src/runtime/os_darwin.go:0",
+      "line": 0,
+      "name": "runtime.mach_semrelease",
+      "selfWeight": 0,
+      "totalWeight": 1,
+    },
+    Frame {
+      "col": undefined,
+      "file": "/usr/local/Cellar/go/1.10.1/libexec/src/runtime/sys_darwin_amd64.s",
+      "key": "runtime.mach_semaphore_signal:/usr/local/Cellar/go/1.10.1/libexec/src/runtime/sys_darwin_amd64.s:0",
+      "line": 0,
+      "name": "runtime.mach_semaphore_signal",
+      "selfWeight": 1,
+      "totalWeight": 1,
+    },
+    Frame {
+      "col": undefined,
+      "file": "/usr/local/Cellar/go/1.10.1/libexec/src/runtime/proc.go",
+      "key": "runtime.mstart:/usr/local/Cellar/go/1.10.1/libexec/src/runtime/proc.go:0",
+      "line": 0,
+      "name": "runtime.mstart",
+      "selfWeight": 0,
+      "totalWeight": 2,
+    },
+    Frame {
+      "col": undefined,
+      "file": "/usr/local/Cellar/go/1.10.1/libexec/src/runtime/proc.go",
+      "key": "runtime.mstart1:/usr/local/Cellar/go/1.10.1/libexec/src/runtime/proc.go:0",
+      "line": 0,
+      "name": "runtime.mstart1",
+      "selfWeight": 0,
+      "totalWeight": 2,
+    },
+    Frame {
+      "col": undefined,
+      "file": "/usr/local/Cellar/go/1.10.1/libexec/src/runtime/proc.go",
+      "key": "runtime.sysmon:/usr/local/Cellar/go/1.10.1/libexec/src/runtime/proc.go:0",
+      "line": 0,
+      "name": "runtime.sysmon",
+      "selfWeight": 0,
+      "totalWeight": 2,
+    },
+    Frame {
+      "col": undefined,
+      "file": "/usr/local/Cellar/go/1.10.1/libexec/src/runtime/sys_darwin_amd64.s",
+      "key": "runtime.usleep:/usr/local/Cellar/go/1.10.1/libexec/src/runtime/sys_darwin_amd64.s:0",
+      "line": 0,
+      "name": "runtime.usleep",
+      "selfWeight": 2,
+      "totalWeight": 2,
+    },
+  ],
+  "name": "simple.prof",
+  "stacks": Array [
+    "runtime.main;main.main;main.delta;main.beta 14",
+    "runtime.main;main.main;main.alpha 26",
+    "runtime.main;main.main;main.gamma 27",
+    "runtime.morestack;runtime.newstack;runtime.duffcopy 11",
+    "runtime.main;main.main;main.beta 25",
+    "runtime.main;main.main;main.delta 22",
+    "runtime.main;main.main;main.delta;main.alpha 22",
+    "runtime.timerproc;runtime.goroutineReady;runtime.goready;runtime.systemstack;runtime.goready.func1;runtime.ready;runtime.wakep;runtime.startm;runtime.notewakeup;runtime.semawakeup;runtime.mach_semrelease;runtime.mach_semaphore_signal 1",
+    "runtime.mstart;runtime.mstart1;runtime.sysmon;runtime.usleep 2",
+  ],
+}
+`;
+
+exports[`importAsPprofProfile: indexToView 1`] = `0`;
+
+exports[`importAsPprofProfile: profileGroup.name 1`] = `"simple.prof"`;

src/import/__snapshots__/safari.test.ts.snap

@@ -0,0 +1,101 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`importFromSafari 1`] = `
+Object {
+  "frames": Array [
+    Frame {
+      "col": 13,
+      "file": "__InjectedScript_InjectedScriptSource.js",
+      "key": "injectModule:__InjectedScript_InjectedScriptSource.js:109:13",
+      "line": 109,
+      "name": "injectModule",
+      "selfWeight": 0,
+      "totalWeight": 0.001,
+    },
+    Frame {
+      "col": 10,
+      "file": "__InjectedScript_CommandLineAPIModuleSource.js",
+      "key": ":__InjectedScript_CommandLineAPIModuleSource.js:2:10",
+      "line": 2,
+      "name": "(anonymous)",
+      "selfWeight": 0.001,
+      "totalWeight": 0.001,
+    },
+    Frame {
+      "col": 1,
+      "file": "file:///speedscope/sample/programs/javascript/simple.js",
+      "key": "(program):file:///speedscope/sample/programs/javascript/simple.js:1:1",
+      "line": 1,
+      "name": "(program)",
+      "selfWeight": 0,
+      "totalWeight": 0.03248933597933502,
+    },
+    Frame {
+      "col": 15,
+      "file": "file:///speedscope/sample/programs/javascript/simple.js",
+      "key": "alpha:file:///speedscope/sample/programs/javascript/simple.js:1:15",
+      "line": 1,
+      "name": "alpha",
+      "selfWeight": 0,
+      "totalWeight": 0.03248933597933502,
+    },
+    Frame {
+      "col": 15,
+      "file": "file:///speedscope/sample/programs/javascript/simple.js",
+      "key": "delta:file:///speedscope/sample/programs/javascript/simple.js:14:15",
+      "line": 14,
+      "name": "delta",
+      "selfWeight": 0.003094222474222382,
+      "totalWeight": 0.020112446082445484,
+    },
+    Frame {
+      "col": 15,
+      "file": "file:///speedscope/sample/programs/javascript/simple.js",
+      "key": "gamma:file:///speedscope/sample/programs/javascript/simple.js:20:15",
+      "line": 20,
+      "name": "gamma",
+      "selfWeight": 0.029395113505112636,
+      "totalWeight": 0.029395113505112636,
+    },
+    Frame {
+      "col": 14,
+      "file": "file:///speedscope/sample/programs/javascript/simple.js",
+      "key": "beta:file:///speedscope/sample/programs/javascript/simple.js:8:14",
+      "line": 8,
+      "name": "beta",
+      "selfWeight": 0,
+      "totalWeight": 0.012376889896889526,
+    },
+    Frame {
+      "col": 102,
+      "file": "",
+      "key": "firstOpenSearchURLString::4:102",
+      "line": 4,
+      "name": "firstOpenSearchURLString",
+      "selfWeight": 0.0005174240213818848,
+      "totalWeight": 0.0005174240213818848,
+    },
+  ],
+  "name": "Grabación de Control temporal 1",
+  "stacks": Array [
+    "injectModule;(anonymous) 1.00ms",
+    " 39.93ms",
+    "(program);alpha;delta;gamma 10.83ms",
+    " 2.46ms",
+    "(program);alpha;delta 3.09ms",
+    "(program);alpha;beta;gamma 4.64ms",
+    "(program);alpha;delta;gamma 1.55ms",
+    "(program);alpha;beta;gamma 1.55ms",
+    "(program);alpha;delta;gamma 3.09ms",
+    "(program);alpha;beta;gamma 4.64ms",
+    "(program);alpha;delta;gamma 1.55ms",
+    "(program);alpha;beta;gamma 1.55ms",
+    " 253.50ms",
+    "firstOpenSearchURLString 517.42µs",
+  ],
+}
+`;
+
+exports[`importFromSafari: indexToView 1`] = `0`;
+
+exports[`importFromSafari: profileGroup.name 1`] = `"Grabación de Control temporal 1"`;

src/import/__snapshots__/trace-event.test.ts.snap

@@ -0,0 +1,528 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`importTraceEvents bad E events 1`] = `
+Object {
+  "frames": Array [
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": "alpha",
+      "line": undefined,
+      "name": "alpha",
+      "selfWeight": 2,
+      "totalWeight": 14,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": "beta",
+      "line": undefined,
+      "name": "beta",
+      "selfWeight": 12,
+      "totalWeight": 12,
+    },
+  ],
+  "name": "pid 0, tid 0",
+  "stacks": Array [
+    "alpha 1.00µs",
+    "alpha;beta 12.00µs",
+    "alpha 1.00µs",
+  ],
+}
+`;
+
+exports[`importTraceEvents bad E events: indexToView 1`] = `0`;
+
+exports[`importTraceEvents bad E events: profileGroup.name 1`] = `"too-many-end-events.json"`;
+
+exports[`importTraceEvents event re-ordering 1`] = `
+Object {
+  "frames": Array [
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": "A",
+      "line": undefined,
+      "name": "A",
+      "selfWeight": 2,
+      "totalWeight": 6,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": "B",
+      "line": undefined,
+      "name": "B",
+      "selfWeight": 2,
+      "totalWeight": 4,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": "C",
+      "line": undefined,
+      "name": "C",
+      "selfWeight": 2,
+      "totalWeight": 2,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": "X",
+      "line": undefined,
+      "name": "X",
+      "selfWeight": 3,
+      "totalWeight": 3,
+    },
+  ],
+  "name": "pid 0, tid 1",
+  "stacks": Array [
+    "A;B;C 1.00µs",
+    "A;B 1.00µs",
+    "A 1.00µs",
+    " 1.00µs",
+    "A 1.00µs",
+    "A;B 1.00µs",
+    "A;B;C 1.00µs",
+    "X 3.00µs",
+  ],
+}
+`;
+
+exports[`importTraceEvents event re-ordering: indexToView 1`] = `0`;
+
+exports[`importTraceEvents event re-ordering: profileGroup.name 1`] = `"must-retain-original-order.json"`;
+
+exports[`importTraceEvents multiprocess 1`] = `
+Object {
+  "frames": Array [
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": "alpha",
+      "line": undefined,
+      "name": "alpha",
+      "selfWeight": 1,
+      "totalWeight": 1,
+    },
+  ],
+  "name": "p0 (pid 0), p0t0 (tid 0)",
+  "stacks": Array [
+    "alpha 1.00µs",
+  ],
+}
+`;
+
+exports[`importTraceEvents multiprocess 2`] = `
+Object {
+  "frames": Array [
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": "beta",
+      "line": undefined,
+      "name": "beta",
+      "selfWeight": 1,
+      "totalWeight": 1,
+    },
+  ],
+  "name": "p0 (pid 0), p0t1 (tid 1)",
+  "stacks": Array [
+    "beta 1.00µs",
+  ],
+}
+`;
+
+exports[`importTraceEvents multiprocess 3`] = `
+Object {
+  "frames": Array [
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": "gamma",
+      "line": undefined,
+      "name": "gamma",
+      "selfWeight": 1,
+      "totalWeight": 1,
+    },
+  ],
+  "name": "p1 (pid 1), p1t0 (tid 0)",
+  "stacks": Array [
+    "gamma 1.00µs",
+  ],
+}
+`;
+
+exports[`importTraceEvents multiprocess 4`] = `
+Object {
+  "frames": Array [
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": "delta",
+      "line": undefined,
+      "name": "delta",
+      "selfWeight": 1,
+      "totalWeight": 1,
+    },
+  ],
+  "name": "p1 (pid 1), p1t1 (tid 1)",
+  "stacks": Array [
+    "delta 1.00µs",
+  ],
+}
+`;
+
+exports[`importTraceEvents multiprocess 5`] = `
+Object {
+  "frames": Array [
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": "epsilon",
+      "line": undefined,
+      "name": "epsilon",
+      "selfWeight": 1,
+      "totalWeight": 1,
+    },
+  ],
+  "name": "p2t0 (pid 2, tid 0)",
+  "stacks": Array [
+    "epsilon 1.00µs",
+  ],
+}
+`;
+
+exports[`importTraceEvents multiprocess 6`] = `
+Object {
+  "frames": Array [
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": "phi",
+      "line": undefined,
+      "name": "phi",
+      "selfWeight": 1,
+      "totalWeight": 1,
+    },
+  ],
+  "name": "p2t1 (pid 2, tid 1)",
+  "stacks": Array [
+    "phi 1.00µs",
+  ],
+}
+`;
+
+exports[`importTraceEvents multiprocess 7`] = `
+Object {
+  "frames": Array [
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": "zeta",
+      "line": undefined,
+      "name": "zeta",
+      "selfWeight": 1,
+      "totalWeight": 1,
+    },
+  ],
+  "name": "p3 (pid 3, tid 0)",
+  "stacks": Array [
+    "zeta 1.00µs",
+  ],
+}
+`;
+
+exports[`importTraceEvents multiprocess 8`] = `
+Object {
+  "frames": Array [
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": "eta",
+      "line": undefined,
+      "name": "eta",
+      "selfWeight": 1,
+      "totalWeight": 1,
+    },
+  ],
+  "name": "p3 (pid 3, tid 1)",
+  "stacks": Array [
+    "eta 1.00µs",
+  ],
+}
+`;
+
+exports[`importTraceEvents multiprocess: indexToView 1`] = `0`;
+
+exports[`importTraceEvents multiprocess: profileGroup.name 1`] = `"multiprocess.json"`;
+
+exports[`importTraceEvents partial json import 1`] = `
+Object {
+  "frames": Array [
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": "alpha",
+      "line": undefined,
+      "name": "alpha",
+      "selfWeight": 2,
+      "totalWeight": 14,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": "beta",
+      "line": undefined,
+      "name": "beta",
+      "selfWeight": 3,
+      "totalWeight": 12,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": "gamma {\\"detail\\":\\"foobar\\"}",
+      "line": undefined,
+      "name": "gamma {\\"detail\\":\\"foobar\\"}",
+      "selfWeight": 5,
+      "totalWeight": 5,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": "epsilon",
+      "line": undefined,
+      "name": "epsilon",
+      "selfWeight": 4,
+      "totalWeight": 4,
+    },
+  ],
+  "name": "pid 0, tid 0",
+  "stacks": Array [
+    "alpha 1.00µs",
+    "alpha;beta 1.00µs",
+    "alpha;beta;gamma {\\"detail\\":\\"foobar\\"} 5.00µs",
+    "alpha;beta;epsilon 4.00µs",
+    "alpha;beta 2.00µs",
+    "alpha 1.00µs",
+  ],
+}
+`;
+
+exports[`importTraceEvents partial json import trailing comma 1`] = `
+Object {
+  "frames": Array [
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": "alpha",
+      "line": undefined,
+      "name": "alpha",
+      "selfWeight": 2,
+      "totalWeight": 14,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": "beta",
+      "line": undefined,
+      "name": "beta",
+      "selfWeight": 3,
+      "totalWeight": 12,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": "gamma {\\"detail\\":\\"foobar\\"}",
+      "line": undefined,
+      "name": "gamma {\\"detail\\":\\"foobar\\"}",
+      "selfWeight": 5,
+      "totalWeight": 5,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": "epsilon",
+      "line": undefined,
+      "name": "epsilon",
+      "selfWeight": 4,
+      "totalWeight": 4,
+    },
+  ],
+  "name": "pid 0, tid 0",
+  "stacks": Array [
+    "alpha 1.00µs",
+    "alpha;beta 1.00µs",
+    "alpha;beta;gamma {\\"detail\\":\\"foobar\\"} 5.00µs",
+    "alpha;beta;epsilon 4.00µs",
+    "alpha;beta 2.00µs",
+    "alpha 1.00µs",
+  ],
+}
+`;
+
+exports[`importTraceEvents partial json import trailing comma: indexToView 1`] = `0`;
+
+exports[`importTraceEvents partial json import trailing comma: profileGroup.name 1`] = `"simple-partial-trailing-comma.json"`;
+
+exports[`importTraceEvents partial json import whitespace padding 1`] = `
+Object {
+  "frames": Array [
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": "alpha",
+      "line": undefined,
+      "name": "alpha",
+      "selfWeight": 2,
+      "totalWeight": 14,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": "beta",
+      "line": undefined,
+      "name": "beta",
+      "selfWeight": 3,
+      "totalWeight": 12,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": "gamma {\\"detail\\":\\"foobar\\"}",
+      "line": undefined,
+      "name": "gamma {\\"detail\\":\\"foobar\\"}",
+      "selfWeight": 5,
+      "totalWeight": 5,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": "epsilon",
+      "line": undefined,
+      "name": "epsilon",
+      "selfWeight": 4,
+      "totalWeight": 4,
+    },
+  ],
+  "name": "pid 0, tid 0",
+  "stacks": Array [
+    "alpha 1.00µs",
+    "alpha;beta 1.00µs",
+    "alpha;beta;gamma {\\"detail\\":\\"foobar\\"} 5.00µs",
+    "alpha;beta;epsilon 4.00µs",
+    "alpha;beta 2.00µs",
+    "alpha 1.00µs",
+  ],
+}
+`;
+
+exports[`importTraceEvents partial json import whitespace padding: indexToView 1`] = `0`;
+
+exports[`importTraceEvents partial json import whitespace padding: profileGroup.name 1`] = `"simple-partial-whitespace.json"`;
+
+exports[`importTraceEvents partial json import: indexToView 1`] = `0`;
+
+exports[`importTraceEvents partial json import: profileGroup.name 1`] = `"simple-partial.json"`;
+
+exports[`importTraceEvents simple 1`] = `
+Object {
+  "frames": Array [
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": "alpha",
+      "line": undefined,
+      "name": "alpha",
+      "selfWeight": 2,
+      "totalWeight": 14,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": "beta",
+      "line": undefined,
+      "name": "beta",
+      "selfWeight": 3,
+      "totalWeight": 12,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": "gamma {\\"detail\\":\\"foobar\\"}",
+      "line": undefined,
+      "name": "gamma {\\"detail\\":\\"foobar\\"}",
+      "selfWeight": 5,
+      "totalWeight": 5,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": "epsilon",
+      "line": undefined,
+      "name": "epsilon",
+      "selfWeight": 4,
+      "totalWeight": 4,
+    },
+  ],
+  "name": "pid 0, tid 0",
+  "stacks": Array [
+    "alpha 1.00µs",
+    "alpha;beta 1.00µs",
+    "alpha;beta;gamma {\\"detail\\":\\"foobar\\"} 5.00µs",
+    "alpha;beta;epsilon 4.00µs",
+    "alpha;beta 2.00µs",
+    "alpha 1.00µs",
+  ],
+}
+`;
+
+exports[`importTraceEvents simple object 1`] = `
+Object {
+  "frames": Array [
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": "alpha",
+      "line": undefined,
+      "name": "alpha",
+      "selfWeight": 2,
+      "totalWeight": 14,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": "beta",
+      "line": undefined,
+      "name": "beta",
+      "selfWeight": 8,
+      "totalWeight": 12,
+    },
+    Frame {
+      "col": undefined,
+      "file": undefined,
+      "key": "(unnamed)",
+      "line": undefined,
+      "name": "(unnamed)",
+      "selfWeight": 4,
+      "totalWeight": 4,
+    },
+  ],
+  "name": "pid 0, tid 0",
+  "stacks": Array [
+    "alpha 1.00µs",
+    "alpha;beta 6.00µs",
+    "alpha;beta;(unnamed) 4.00µs",
+    "alpha;beta 2.00µs",
+    "alpha 1.00µs",
+  ],
+}
+`;
+
+exports[`importTraceEvents simple object: indexToView 1`] = `0`;
+
+exports[`importTraceEvents simple object: profileGroup.name 1`] = `"simple-object.json"`;
+
+exports[`importTraceEvents simple: indexToView 1`] = `0`;
+
+exports[`importTraceEvents simple: profileGroup.name 1`] = `"simple.json"`;

src/import/bg-flamegraph.test.ts

@@ -3,3 +3,15 @@ import {checkProfileSnapshot} from '../lib/test-utils'
 test('importFromBGFlameGraph', async () => {
   await checkProfileSnapshot('./sample/profiles/stackcollapse/simple.txt')
 })
+
+test('importFromBGFlameGraph with CRLF', async () => {
+  await checkProfileSnapshot('./sample/profiles/stackcollapse/simple-crlf.txt')
+})
+
+test('importFromBGFlameGraph with UTF-16, Little Endian', async () => {
+  await checkProfileSnapshot('./sample/profiles/stackcollapse/simple-utf16-le.txt')
+})
+
+test('importFromBGFlameGraph with UTF-16, Big Endian', async () => {
+  await checkProfileSnapshot('./sample/profiles/stackcollapse/simple-utf16-be.txt')
+})

src/import/chrome.test.ts

@@ -7,3 +7,19 @@ test('importFromChromeCPUProfile', async () => {
 test('importFromChromeTimeline', async () => {
   await checkProfileSnapshot('./sample/profiles/Chrome/65/simple-timeline.json')
 })
+
+test('importFromChromeTimeline Chrome 69', async () => {
+  await checkProfileSnapshot('./sample/profiles/Chrome/69/simple.json')
+})
+
+test('importFromV8Profiler Node 10', async () => {
+  await checkProfileSnapshot('./sample/profiles/node/10.11.0/example.cpuprofile')
+})
+
+test('importFromChromeTimeline Workers Chrome 66', async () => {
+  await checkProfileSnapshot('./sample/profiles/Chrome/66/worker.json')
+})
+
+test('importFromChromeTimeline Workers Chrome 70', async () => {
+  await checkProfileSnapshot('./sample/profiles/Chrome/70/worker.json')
+})

src/import/chrome.ts

@@ -1,6 +1,9 @@
-import {Profile, FrameInfo, CallTreeProfileBuilder} from '../lib/profile'
-import {getOrInsert, lastOf} from '../lib/utils'
+import {Profile, FrameInfo, CallTreeProfileBuilder, ProfileGroup} from '../lib/profile'
+import {getOrInsert, lastOf, sortBy, itForEach} from '../lib/utils'
 import {TimeFormatter} from '../lib/value-formatters'
+import {chromeTreeToNodes, OldCPUProfile} from './v8cpuFormatter'
+
+// See: https://github.com/v8/v8/blob/master/src/inspector/js_protocol.json
 
 interface TimelineEvent {
   pid: number
@@ -13,6 +16,7 @@ interface TimelineEvent {
   tdur: number
   tts: number
   args: {[key: string]: any}
+  id?: string
 }
 
 interface PositionTickInfo {
@@ -28,7 +32,7 @@ interface CPUProfileCallFrame {
   url: string
 }
 
-interface CPUProfileNode {
+export interface CPUProfileNode {
   callFrame: CPUProfileCallFrame
   hitCount: number
   id: number
@@ -37,7 +41,7 @@ interface CPUProfileNode {
   parent?: CPUProfileNode
 }
 
-interface CPUProfile {
+export interface CPUProfile {
   startTime: number
   endTime: number
   nodes: CPUProfileNode[]
@@ -45,16 +49,120 @@ interface CPUProfile {
   timeDeltas: number[]
 }
 
-export function importFromChromeTimeline(events: TimelineEvent[]): Profile {
+export function isChromeTimeline(rawProfile: any): boolean {
+  if (!Array.isArray(rawProfile)) return false
+  if (rawProfile.length < 1) return false
+  const first = rawProfile[0]
+  if (!('pid' in first && 'tid' in first && 'ph' in first && 'cat' in first)) return false
+  if (
+    !rawProfile.find(
+      e => e.name === 'CpuProfile' || e.name === 'Profile' || e.name === 'ProfileChunk',
+    )
+  )
+    return false
+  return true
+}
+
+export function importFromChromeTimeline(events: TimelineEvent[], fileName: string): ProfileGroup {
   // It seems like sometimes Chrome timeline files contain multiple CpuProfiles?
   // For now, choose the first one in the list.
+
+  const cpuProfileByID = new Map<string, CPUProfile>()
+
+  // Maps profile IDs (like "0x3") to pid/tid pairs formatted as `${pid}:${tid}`
+  const pidTidById = new Map<string, string>()
+
+  // Maps pid/tid pairs to thread names
+  const threadNameByPidTid = new Map<string, string>()
+
+  // The events aren't necessarily recorded in chronological order. Sort them so
+  // that they are.
+  sortBy(events, e => e.ts)
+
   for (let event of events) {
-    if (event.name == 'CpuProfile') {
-      const chromeProfile = event.args.data.cpuProfile as CPUProfile
-      return importFromChromeCPUProfile(chromeProfile)
+    if (event.name === 'CpuProfile') {
+      const pidTid = `${event.pid}:${event.tid}`
+      const id = event.id || pidTid
+      cpuProfileByID.set(id, event.args.data.cpuProfile as CPUProfile)
+      pidTidById.set(id, pidTid)
+    }
+
+    if (event.name === 'Profile') {
+      const pidTid = `${event.pid}:${event.tid}`
+      cpuProfileByID.set(event.id || pidTid, {
+        startTime: 0,
+        endTime: 0,
+        nodes: [],
+        samples: [],
+        timeDeltas: [],
+        ...event.args.data,
+      })
+
+      if (event.id) {
+        pidTidById.set(event.id, `${event.pid}:${event.tid}`)
+      }
+    }
+
+    if (event.name === 'thread_name') {
+      threadNameByPidTid.set(`${event.pid}:${event.tid}`, event.args.name)
+    }
+
+    if (event.name === 'ProfileChunk') {
+      const pidTid = `${event.pid}:${event.tid}`
+      const cpuProfile = cpuProfileByID.get(event.id || pidTid)
+      if (cpuProfile) {
+        const chunk = event.args.data
+        if (chunk.cpuProfile) {
+          if (chunk.cpuProfile.nodes) {
+            cpuProfile.nodes = cpuProfile.nodes.concat(chunk.cpuProfile.nodes)
+          }
+          if (chunk.cpuProfile.samples) {
+            cpuProfile.samples = cpuProfile.samples.concat(chunk.cpuProfile.samples)
+          }
+        }
+        if (chunk.timeDeltas) {
+          cpuProfile.timeDeltas = cpuProfile.timeDeltas.concat(chunk.timeDeltas)
+        }
+        if (chunk.startTime != null) {
+          cpuProfile.startTime = chunk.startTime
+        }
+        if (chunk.endTime != null) {
+          cpuProfile.endTime = chunk.endTime
+        }
+      } else {
+        console.warn(`Ignoring ProfileChunk for undeclared Profile with id ${event.id || pidTid}`)
+      }
     }
   }
-  throw new Error('Could not find CPU profile in Timeline')
+
+  if (cpuProfileByID.size > 0) {
+    const profiles: Profile[] = []
+    let indexToView = 0
+
+    itForEach(cpuProfileByID.keys(), profileId => {
+      let threadName: string | null = null
+      let pidTid = pidTidById.get(profileId)
+      if (pidTid) {
+        threadName = threadNameByPidTid.get(pidTid) || null
+        if (threadName) {
+        }
+      }
+      const profile = importFromChromeCPUProfile(cpuProfileByID.get(profileId)!)
+      if (threadName && cpuProfileByID.size > 1) {
+        profile.setName(`${fileName} - ${threadName}`)
+        if (threadName === 'CrRendererMain') {
+          indexToView = profiles.length
+        }
+      } else {
+        profile.setName(`${fileName}`)
+      }
+      profiles.push(profile)
+    })
+
+    return {name: fileName, indexToView, profiles}
+  } else {
+    throw new Error('Could not find CPU profile in Timeline')
+  }
 }
 
 const callFrameToFrameInfo = new Map<CPUProfileCallFrame, FrameInfo>()
@@ -74,7 +182,14 @@ function frameInfoForCallFrame(callFrame: CPUProfileCallFrame) {
   })
 }
 
-function shouldIgnoreFunction(functionName: string) {
+function shouldIgnoreFunction(callFrame: CPUProfileCallFrame) {
+  const {functionName, url} = callFrame
+  if (url === 'native dummy.js') {
+    // I'm not really sure what this is about, but this seems to be used
+    // as a way of avoiding edge cases in V8's implementation.
+    // See: https://github.com/v8/v8/blob/b8626ca4/tools/js2c.py#L419-L424
+    return true
+  }
   return functionName === '(root)' || functionName === '(idle)'
 }
 
@@ -90,6 +205,10 @@ export function importFromChromeCPUProfile(chromeProfile: CPUProfile): Profile {
     nodeById.set(node.id, node)
   }
   for (let node of chromeProfile.nodes) {
+    if (typeof node.parent === 'number') {
+      node.parent = nodeById.get(node.parent)
+    }
+
     if (!node.children) continue
     for (let childId of node.children) {
       const child = nodeById.get(childId)
@@ -99,9 +218,16 @@ export function importFromChromeCPUProfile(chromeProfile: CPUProfile): Profile {
   }
 
   const samples: number[] = []
-  const timeDeltas: number[] = []
+  const sampleTimes: number[] = []
+
+  // The first delta is relative to the profile startTime.
+  // Ref: https://github.com/v8/v8/blob/44bd8fd7/src/inspector/js_protocol.json#L1485
+  let elapsed = chromeProfile.timeDeltas[0]
+
+  // Prevents negative time deltas from causing bad data. See
+  // https://github.com/jlfwong/speedscope/pull/305 for details.
+  let lastValidElapsed = elapsed
 
-  let elapsed = 0
   let lastNodeId = NaN
 
   // The chrome CPU profile format doesn't collapse identical samples. We'll do that
@@ -110,29 +236,35 @@ export function importFromChromeCPUProfile(chromeProfile: CPUProfile): Profile {
     const nodeId = chromeProfile.samples[i]
     if (nodeId != lastNodeId) {
       samples.push(nodeId)
-      timeDeltas.push(elapsed)
-      elapsed = 0
+      if (elapsed < lastValidElapsed) {
+        sampleTimes.push(lastValidElapsed)
+      } else {
+        sampleTimes.push(elapsed)
+        lastValidElapsed = elapsed
+      }
     }
 
-    let timeDelta = chromeProfile.timeDeltas[i]
-    if (timeDelta < 0) {
-      console.warn('Substituting zero for unexpected time delta:', timeDelta, 'at index', i)
-      timeDelta = 0
+    if (i === chromeProfile.samples.length - 1) {
+      if (!isNaN(lastNodeId)) {
+        samples.push(lastNodeId)
+        if (elapsed < lastValidElapsed) {
+          sampleTimes.push(lastValidElapsed)
+        } else {
+          sampleTimes.push(elapsed)
+          lastValidElapsed = elapsed
+        }
+      }
+    } else {
+      const timeDelta = chromeProfile.timeDeltas[i + 1]
+      elapsed += timeDelta
+      lastNodeId = nodeId
     }
-
-    elapsed += timeDelta
-    lastNodeId = nodeId
-  }
-  if (!isNaN(lastNodeId)) {
-    samples.push(lastNodeId)
-    timeDeltas.push(elapsed)
   }
 
   let prevStack: CPUProfileNode[] = []
 
-  let value = 0
   for (let i = 0; i < samples.length; i++) {
-    const timeDelta = timeDeltas[i + 1] || 0
+    const value = sampleTimes[i]
     const nodeId = samples[i]
     let stackTop = nodeById.get(nodeId)
     if (!stackTop) continue
@@ -161,7 +293,7 @@ export function importFromChromeCPUProfile(chromeProfile: CPUProfile): Profile {
     const toOpen: CPUProfileNode[] = []
     for (
       let node: CPUProfileNode | null = stackTop;
-      node && node != lca && !shouldIgnoreFunction(node.callFrame.functionName);
+      node && node != lca && !shouldIgnoreFunction(node.callFrame);
       // Place Chrome internal functions on top of the previous call stack
       node = shouldPlaceOnTopOfPreviousStack(node.callFrame.functionName)
         ? lastOf(prevStack)
@@ -176,14 +308,17 @@ export function importFromChromeCPUProfile(chromeProfile: CPUProfile): Profile {
     }
 
     prevStack = prevStack.concat(toOpen)
-    value += timeDelta
   }
 
   // Close frames that are open at the end of the trace
   for (let i = prevStack.length - 1; i >= 0; i--) {
-    profile.leaveFrame(frameInfoForCallFrame(prevStack[i].callFrame), value)
+    profile.leaveFrame(frameInfoForCallFrame(prevStack[i].callFrame), lastOf(sampleTimes)!)
   }
 
   profile.setValueFormatter(new TimeFormatter('microseconds'))
   return profile.build()
 }
+
+export function importFromOldV8CPUProfile(content: OldCPUProfile): Profile {
+  return importFromChromeCPUProfile(chromeTreeToNodes(content))
+}

src/import/firefox.test.ts

@@ -7,3 +7,7 @@ test('importFromFirefox', async () => {
 test('importFromFirefox recursion', async () => {
   await checkProfileSnapshot('./sample/profiles/Firefox/61/recursion.json')
 })
+
+test('importFromFirefox ignore self-hosted', async () => {
+  await checkProfileSnapshot('./sample/profiles/Firefox/63/simple-firefox.json')
+})

src/import/firefox.ts

@@ -180,7 +180,11 @@ export function importFromFirefox(firefoxProfile: FirefoxProfile): Profile {
 
         if (!match) return null
 
-        if (match[2].startsWith('resource:') || match[2] === 'self-hosted') {
+        if (
+          match[2].startsWith('resource:') ||
+          match[2] === 'self-hosted' ||
+          match[2].startsWith('self-hosted:')
+        ) {
           // Ignore Firefox-internals stuff
           return null
         }

src/import/haskell.test.ts

@@ -0,0 +1,5 @@
+import {checkProfileSnapshot} from '../lib/test-utils'
+
+test('importFromHaskell', async () => {
+  await checkProfileSnapshot('./sample/profiles/haskell/simple.prof')
+})

src/import/haskell.ts

@@ -0,0 +1,98 @@
+import {ProfileGroup, FrameInfo, CallTreeProfileBuilder} from '../lib/profile'
+import {TimeFormatter, ByteFormatter} from '../lib/value-formatters'
+
+// See https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/profiling.html#json-profile-format
+// for information on the GHC profiler JSON output format.
+
+interface CostCentre {
+  id: number
+  label: string
+  module: string
+  src_loc: string
+  is_caf: boolean
+}
+
+interface ProfileTree {
+  id: number
+  entries: number
+  alloc: number
+  ticks: number
+  children: ProfileTree[]
+}
+
+interface HaskellProfile {
+  program: string
+  arguments: string[]
+  rts_arguments: string[]
+  end_time: string
+  initial_capabilities: number
+  total_time: number
+  total_ticks: number
+  tick_interval: number
+  total_alloc: number
+  cost_centres: CostCentre[]
+  profile: ProfileTree
+}
+
+// The profiler already collapses recursion before output so using the JS stack here should be fine
+function addToProfile(
+  tree: ProfileTree,
+  startVal: number,
+  profile: CallTreeProfileBuilder,
+  infos: Map<number, FrameInfo>,
+  attribute: (tree: ProfileTree) => number,
+): number {
+  // If the expression never did anything we don't care about it
+  if (tree.ticks === 0 && tree.entries === 0 && tree.alloc === 0 && tree.children.length === 0)
+    return startVal
+
+  let curVal = startVal
+  let frameInfo = infos.get(tree.id)!
+
+  profile.enterFrame(frameInfo, curVal)
+
+  for (let child of tree.children) {
+    curVal = addToProfile(child, curVal, profile, infos, attribute)
+  }
+
+  curVal += attribute(tree)
+
+  profile.leaveFrame(frameInfo, curVal)
+
+  return curVal
+}
+
+export function importFromHaskell(haskellProfile: HaskellProfile): ProfileGroup {
+  const idToFrameInfo = new Map<number, FrameInfo>()
+  for (let centre of haskellProfile.cost_centres) {
+    const frameInfo: FrameInfo = {
+      key: centre.id,
+      name: `${centre.module}.${centre.label}`,
+    }
+
+    // Ignore things like <entire-module> and <no location info>
+    if (!centre.src_loc.startsWith('<')) {
+      // This also contains line and column information, but sometimes it contains ranges,
+      // and in varying formats, so it's a better experience just to leave it as is
+      frameInfo.file = centre.src_loc
+    }
+
+    idToFrameInfo.set(centre.id, frameInfo)
+  }
+
+  const timeProfile = new CallTreeProfileBuilder(haskellProfile.total_ticks)
+  addToProfile(haskellProfile.profile, 0, timeProfile, idToFrameInfo, tree => tree.ticks)
+  timeProfile.setValueFormatter(new TimeFormatter('milliseconds'))
+  timeProfile.setName(`${haskellProfile.program} time`)
+
+  const allocProfile = new CallTreeProfileBuilder(haskellProfile.total_ticks)
+  addToProfile(haskellProfile.profile, 0, allocProfile, idToFrameInfo, tree => tree.alloc)
+  allocProfile.setValueFormatter(new ByteFormatter())
+  allocProfile.setName(`${haskellProfile.program} allocation`)
+
+  return {
+    name: haskellProfile.program,
+    indexToView: 0,
+    profiles: [timeProfile.build(), allocProfile.build()],
+  }
+}

src/import/index.test.ts

@@ -1,8 +1,12 @@
-import {importProfileGroup} from '.'
+import {importProfileGroupFromText} from '.'
 
 test('importProfileGroup', async () => {
   // Importing garbage should return null
-  expect(await importProfileGroup('unknown', '')).toBe(null)
-  expect(await importProfileGroup('unknown', 'Hello world')).toBe(null)
-  expect(await importProfileGroup('unknown', 'Hello\n\nWorld')).toBe(null)
+  expect(await importProfileGroupFromText('unknown', '')).toBe(null)
+  expect(await importProfileGroupFromText('unknown', 'Hello world')).toBe(null)
+  expect(await importProfileGroupFromText('unknown', 'Hello\n\nWorld')).toBe(null)
+
+  // Importing from a version of stackprof which was missing raw_timestamp_deltas should return null
+  const oldStackprof = `{"version":1.2,"mode":"wall","interval":1000,"samples":0,"gc_samples":0,"missed_samples":0,"frames":{}}`
+  expect(await importProfileGroupFromText('unknown', oldStackprof)).toBe(null)
 })

src/import/index.ts

@@ -1,7 +1,12 @@
 import {Profile, ProfileGroup} from '../lib/profile'
 import {FileSystemDirectoryEntry} from './file-system-entry'
 
-import {importFromChromeCPUProfile, importFromChromeTimeline} from './chrome'
+import {
+  importFromChromeCPUProfile,
+  importFromChromeTimeline,
+  isChromeTimeline,
+  importFromOldV8CPUProfile,
+} from './chrome'
 import {importFromStackprof} from './stackprof'
 import {importFromInstrumentsDeepCopy, importFromInstrumentsTrace} from './instruments'
 import {importFromBGFlameGraph} from './bg-flamegraph'
@@ -9,12 +14,45 @@ import {importFromFirefox} from './firefox'
 import {importSpeedscopeProfiles} from '../lib/file-format'
 import {importFromV8ProfLog} from './v8proflog'
 import {importFromLinuxPerf} from './linux-tools-perf'
+import {importFromHaskell} from './haskell'
+import {importFromSafari} from './safari'
+import {ProfileDataSource, TextProfileDataSource, MaybeCompressedDataReader} from './utils'
+import {importAsPprofProfile} from './pprof'
+import {decodeBase64} from '../lib/utils'
+import {importFromChromeHeapProfile} from './v8heapalloc'
+import {isTraceEventFormatted, importTraceEvents} from './trace-event'
 
-export async function importProfileGroup(
+export async function importProfileGroupFromText(
   fileName: string,
   contents: string,
 ): Promise<ProfileGroup | null> {
-  const profileGroup = await _importProfileGroup(fileName, contents)
+  return await importProfileGroup(new TextProfileDataSource(fileName, contents))
+}
+
+export async function importProfileGroupFromBase64(
+  fileName: string,
+  b64contents: string,
+): Promise<ProfileGroup | null> {
+  return await importProfileGroup(
+    MaybeCompressedDataReader.fromArrayBuffer(fileName, decodeBase64(b64contents).buffer),
+  )
+}
+
+export async function importProfilesFromFile(file: File): Promise<ProfileGroup | null> {
+  return importProfileGroup(MaybeCompressedDataReader.fromFile(file))
+}
+
+export async function importProfilesFromArrayBuffer(
+  fileName: string,
+  buffer: ArrayBuffer,
+): Promise<ProfileGroup | null> {
+  return importProfileGroup(MaybeCompressedDataReader.fromArrayBuffer(fileName, buffer))
+}
+
+async function importProfileGroup(dataSource: ProfileDataSource): Promise<ProfileGroup | null> {
+  const fileName = await dataSource.name()
+
+  const profileGroup = await _importProfileGroup(dataSource)
   if (profileGroup) {
     if (!profileGroup.name) {
       profileGroup.name = fileName
@@ -34,20 +72,48 @@ function toGroup(profile: Profile | null): ProfileGroup | null {
   return {name: profile.getName(), indexToView: 0, profiles: [profile]}
 }
 
-async function _importProfileGroup(
-  fileName: string,
-  contents: string,
-): Promise<ProfileGroup | null> {
+function fixUpJSON(content: string): string {
+  // This code is similar to the code from here:
+  // https://github.com/catapult-project/catapult/blob/27e047e0494df162022be6aa8a8862742a270232/tracing/tracing/extras/importer/trace_event_importer.html#L197-L208
+  //
+  //   If the event data begins with a [, then we know it should end with a ]. The
+  //   reason we check for this is because some tracing implementations cannot
+  //   guarantee that a ']' gets written to the trace file. So, we are forgiving
+  //   and if this is obviously the case, we fix it up before throwing the string
+  //   at JSON.parse.
+  //
+  content = content.trim()
+  if (content[0] === '[') {
+    content = content.replace(/,\s*$/, '')
+    if (content[content.length - 1] !== ']') {
+      content += ']'
+    }
+  }
+  return content
+}
+
+async function _importProfileGroup(dataSource: ProfileDataSource): Promise<ProfileGroup | null> {
+  const fileName = await dataSource.name()
+
+  const buffer = await dataSource.readAsArrayBuffer()
+
+  {
+    const profile = importAsPprofProfile(buffer)
+    if (profile) {
+      console.log('Importing as protobuf encoded pprof file')
+      return toGroup(profile)
+    }
+  }
+
+  const contents = await dataSource.readAsText()
+
   // First pass: Check known file format names to infer the file type
   if (fileName.endsWith('.speedscope.json')) {
     console.log('Importing as speedscope json file')
     return importSpeedscopeProfiles(JSON.parse(contents))
-  } else if (fileName.endsWith('.cpuprofile')) {
-    console.log('Importing as Chrome CPU Profile')
-    return toGroup(importFromChromeCPUProfile(JSON.parse(contents)))
   } else if (fileName.endsWith('.chrome.json') || /Profile-\d{8}T\d{6}/.exec(fileName)) {
     console.log('Importing as Chrome Timeline')
-    return toGroup(importFromChromeTimeline(JSON.parse(contents)))
+    return importFromChromeTimeline(JSON.parse(contents), fileName)
   } else if (fileName.endsWith('.stackprof.json')) {
     console.log('Importing as stackprof profile')
     return toGroup(importFromStackprof(JSON.parse(contents)))
@@ -63,12 +129,18 @@ async function _importProfileGroup(
   } else if (fileName.endsWith('.v8log.json')) {
     console.log('Importing as --prof-process v8 log')
     return toGroup(importFromV8ProfLog(JSON.parse(contents)))
+  } else if (fileName.endsWith('.heapprofile')) {
+    console.log('Importing as Chrome Heap Profile')
+    return toGroup(importFromChromeHeapProfile(JSON.parse(contents)))
+  } else if (fileName.endsWith('-recording.json')) {
+    console.log('Importing as Safari profile')
+    return toGroup(importFromSafari(JSON.parse(contents)))
   }
 
   // Second pass: Try to guess what file format it is based on structure
   let parsed: any
   try {
-    parsed = JSON.parse(contents)
+    parsed = JSON.parse(fixUpJSON(contents))
   } catch (e) {}
   if (parsed) {
     if (parsed['$schema'] === 'https://www.speedscope.app/file-format-schema.json') {
@@ -77,18 +149,33 @@ async function _importProfileGroup(
     } else if (parsed['systemHost'] && parsed['systemHost']['name'] == 'Firefox') {
       console.log('Importing as Firefox profile')
       return toGroup(importFromFirefox(parsed))
-    } else if (Array.isArray(parsed) && parsed[parsed.length - 1].name === 'CpuProfile') {
-      console.log('Importing as Chrome CPU Profile')
-      return toGroup(importFromChromeTimeline(parsed))
-    } else if ('nodes' in parsed && 'samples' in parsed && 'timeDeltas' in parsed) {
+    } else if (isChromeTimeline(parsed)) {
       console.log('Importing as Chrome Timeline')
+      return importFromChromeTimeline(parsed, fileName)
+    } else if ('nodes' in parsed && 'samples' in parsed && 'timeDeltas' in parsed) {
+      console.log('Importing as Chrome CPU Profile')
       return toGroup(importFromChromeCPUProfile(parsed))
-    } else if ('mode' in parsed && 'frames' in parsed) {
+    } else if (isTraceEventFormatted(parsed)) {
+      console.log('Importing as Trace Event Format profile')
+      return importTraceEvents(parsed)
+    } else if ('head' in parsed && 'samples' in parsed && 'timestamps' in parsed) {
+      console.log('Importing as Chrome CPU Profile (old format)')
+      return toGroup(importFromOldV8CPUProfile(parsed))
+    } else if ('mode' in parsed && 'frames' in parsed && 'raw_timestamp_deltas' in parsed) {
       console.log('Importing as stackprof profile')
       return toGroup(importFromStackprof(parsed))
     } else if ('code' in parsed && 'functions' in parsed && 'ticks' in parsed) {
       console.log('Importing as --prof-process v8 log')
       return toGroup(importFromV8ProfLog(parsed))
+    } else if ('head' in parsed && 'selfSize' in parsed['head']) {
+      console.log('Importing as Chrome Heap Profile')
+      return toGroup(importFromChromeHeapProfile(JSON.parse(contents)))
+    } else if ('rts_arguments' in parsed && 'initial_capabilities' in parsed) {
+      console.log('Importing as Haskell GHC JSON Profile')
+      return importFromHaskell(parsed)
+    } else if ('recording' in parsed && 'sampleStackTraces' in parsed.recording) {
+      console.log('Importing as Safari profile')
+      return toGroup(importFromSafari(JSON.parse(contents)))
     }
   } else {
     // Format is not JSON
@@ -103,7 +190,7 @@ async function _importProfileGroup(
     // If every line ends with a space followed by a number, it's probably
     // the collapsed stack format.
     const lineCount = contents.split(/\n/).length
-    if (lineCount >= 1 && lineCount === contents.split(/ \d+\n/).length) {
+    if (lineCount >= 1 && lineCount === contents.split(/ \d+\r?\n/).length) {
       console.log('Importing as collapsed stack format')
       return toGroup(importFromBGFlameGraph(contents))
     }

src/import/instruments.test.ts

@@ -98,4 +98,7 @@ describe('importFromInstrumentsTrace', () => {
   test('Instruments 9.3.1', async () => {
     await importFromTrace('./sample/profiles/Instruments/9.3.1/simple-time-profile.trace.zip')
   })
+  test('Instruments 10.0', async () => {
+    await importFromTrace('./sample/profiles/Instruments/10.0/simple-time-profile.trace.zip')
+  })
 })

src/import/instruments.ts

@@ -9,9 +9,9 @@ import {
   ProfileGroup,
 } from '../lib/profile'
 import {sortBy, getOrThrow, getOrInsert, lastOf, getOrElse, zeroPad} from '../lib/utils'
-import * as pako from 'pako'
 import {ByteFormatter, TimeFormatter} from '../lib/value-formatters'
 import {FileSystemDirectoryEntry, FileSystemEntry, FileSystemFileEntry} from './file-system-entry'
+import {MaybeCompressedDataReader} from './utils'
 
 function parseTSV<T>(contents: string): T[] {
   const lines = contents.split('\n').map(l => l.split('\t'))
@@ -183,56 +183,12 @@ async function extractDirectoryTree(entry: FileSystemDirectoryEntry): Promise<Tr
   return node
 }
 
-class MaybeCompressedFileReader {
-  private fileData: Promise<ArrayBuffer>
-
-  constructor(file: File) {
-    this.fileData = new Promise(resolve => {
-      const reader = new FileReader()
-      reader.addEventListener('loadend', () => {
-        if (!(reader.result instanceof ArrayBuffer)) {
-          throw new Error('Expected reader.result to be an instance of ArrayBuffer')
-        }
-        resolve(reader.result)
-      })
-      reader.readAsArrayBuffer(file)
-    })
-  }
-
-  private async getUncompressed(): Promise<ArrayBuffer> {
-    const fileData = await this.fileData
-    try {
-      const result = pako.inflate(new Uint8Array(fileData)).buffer
-      return result
-    } catch (e) {
-      return fileData
-    }
-  }
-
-  async readAsArrayBuffer(): Promise<ArrayBuffer> {
-    return await this.getUncompressed()
-  }
-
-  async readAsText(): Promise<string> {
-    const buffer = await this.getUncompressed()
-    let ret: string = ''
-
-    // JavaScript strings are UTF-16 encoded, but this data is coming
-    // from a UTF-8 encoded file.
-    const array = new Uint8Array(buffer)
-    for (let i = 0; i < array.length; i++) {
-      ret += String.fromCharCode(array[i])
-    }
-    return ret
-  }
-}
-
 function readAsArrayBuffer(file: File): Promise<ArrayBuffer> {
-  return new MaybeCompressedFileReader(file).readAsArrayBuffer()
+  return MaybeCompressedDataReader.fromFile(file).readAsArrayBuffer()
 }
 
 function readAsText(file: File): Promise<string> {
-  return new MaybeCompressedFileReader(file).readAsText()
+  return MaybeCompressedDataReader.fromFile(file).readAsText()
 }
 
 function getCoreDirForRun(tree: TraceDirectoryTree, selectedRun: number): TraceDirectoryTree {
@@ -405,7 +361,10 @@ async function readFormTemplate(tree: TraceDirectoryTree): Promise<FormTemplateD
   const archive = readInstrumentsKeyedArchive(await readAsArrayBuffer(formTemplate))
 
   const version = archive['com.apple.xray.owner.template.version']
-  const selectedRunNumber = archive['com.apple.xray.owner.template'].get('_selectedRunNumber')
+  let selectedRunNumber = 1
+  if ('com.apple.xray.owner.template' in archive) {
+    selectedRunNumber = archive['com.apple.xray.owner.template'].get('_selectedRunNumber')
+  }
   let instrument = archive['$1']
   if ('stubInfoByUUID' in archive) {
     instrument = Array.from(archive['stubInfoByUUID'].keys())[0]
@@ -674,7 +633,7 @@ export function readInstrumentsKeyedArchive(buffer: ArrayBuffer): any {
 ////////////////////////////////////////////////////////////////////////////////
 
 export function decodeUTF8(bytes: Uint8Array): string {
-  let text = String.fromCharCode.apply(String, bytes)
+  let text = String.fromCharCode.apply(String, Array.from(bytes))
   if (text.slice(-1) === '\0') text = text.slice(0, -1) // Remove a single trailing null character if present
   return decodeURIComponent(escape(text))
 }
@@ -781,7 +740,10 @@ function paternMatchObjectiveC(
       // Replace NSString with a string
       case 'NSString':
       case 'NSMutableString':
-        return decodeUTF8(value['NS.bytes'])
+        if (value['NS.string']) return value['NS.string']
+        if (value['NS.bytes']) return decodeUTF8(value['NS.bytes'])
+        console.warn(`Unexpected ${name} format: `, value)
+        return null
 
       // Replace NSArray with an Array
       case 'NSArray':

src/import/linux-tools-perf.test.ts

@@ -1,6 +1,6 @@
 import {checkProfileSnapshot} from '../lib/test-utils'
 
-describe('importFromLinuxPerf', async () => {
+describe('importFromLinuxPerf', () => {
   test('simple.linux-perf.txt', async () => {
     await checkProfileSnapshot('./sample/profiles/linux-perf/simple.linux-perf.txt')
   })

src/import/pprof.test.ts

@@ -0,0 +1,5 @@
+import {checkProfileSnapshot} from '../lib/test-utils'
+
+test('importAsPprofProfile', async () => {
+  await checkProfileSnapshot('./sample/profiles/pprof/simple.prof')
+})

src/import/pprof.ts

@@ -0,0 +1,134 @@
+import {perftools} from './profile.proto.js'
+import {FrameInfo, StackListProfileBuilder, Profile} from '../lib/profile'
+import {lastOf} from '../lib/utils'
+import {TimeFormatter, ByteFormatter} from '../lib/value-formatters'
+
+interface SampleType {
+  type: string
+  unit: string
+}
+
+export function importAsPprofProfile(rawProfile: ArrayBuffer): Profile | null {
+  if (rawProfile.byteLength === 0) return null
+
+  let protoProfile: perftools.profiles.Profile
+  try {
+    protoProfile = perftools.profiles.Profile.decode(new Uint8Array(rawProfile))
+  } catch (e) {
+    return null
+  }
+
+  function i32(n: number | Long): number {
+    return typeof n === 'number' ? n : (n as Long).low
+  }
+
+  function stringVal(key: number | Long): string | null {
+    return protoProfile.stringTable[i32(key)] || null
+  }
+
+  const frameInfoByFunctionID = new Map<number, FrameInfo>()
+
+  function frameInfoForFunction(f: perftools.profiles.IFunction): FrameInfo | null {
+    const {name, filename, startLine} = f
+
+    const nameString = (name != null && stringVal(name)) || '(unknown)'
+    const fileNameString = filename != null ? stringVal(filename) : null
+    const line = startLine != null ? +startLine : null
+
+    const key = `${nameString}:${fileNameString}:${line}`
+
+    const frameInfo: FrameInfo = {
+      key,
+      name: nameString,
+    }
+
+    if (fileNameString != null) {
+      frameInfo.file = fileNameString
+    }
+
+    if (line != null) {
+      frameInfo.line = line
+    }
+
+    return frameInfo
+  }
+
+  for (let f of protoProfile.function) {
+    if (f.id) {
+      const frameInfo = frameInfoForFunction(f)
+      if (frameInfo != null) {
+        frameInfoByFunctionID.set(i32(f.id), frameInfo)
+      }
+    }
+  }
+
+  function frameInfoForLocation(location: perftools.profiles.ILocation): FrameInfo | null {
+    const {line} = location
+    if (line == null) return null
+
+    // From a comment on profile.proto:
+    //
+    //   Multiple line indicates this location has inlined functions,
+    //   where the last entry represents the caller into which the
+    //   preceding entries were inlined.
+    //
+    //   E.g., if memcpy() is inlined into printf:
+    //      line[0].function_name == "memcpy"
+    //      line[1].function_name == "printf"
+    //
+    // Let's just take the last line then
+    const lastLine = lastOf(line)
+    if (lastLine == null) return null
+
+    if (lastLine.functionId) {
+      return frameInfoByFunctionID.get(i32(lastLine.functionId)) || null
+    } else {
+      return null
+    }
+  }
+
+  const frameByLocationID = new Map<number, FrameInfo>()
+
+  for (let l of protoProfile.location) {
+    if (l.id != null) {
+      const frameInfo = frameInfoForLocation(l)
+      if (frameInfo) {
+        frameByLocationID.set(i32(l.id), frameInfo)
+      }
+    }
+  }
+
+  const sampleTypes: SampleType[] = protoProfile.sampleType.map(type => ({
+    type: (type.type && stringVal(type.type)) || 'samples',
+    unit: (type.unit && stringVal(type.unit)) || 'count',
+  }))
+
+  const sampleTypeIndex = protoProfile.defaultSampleType
+    ? +protoProfile.defaultSampleType
+    : sampleTypes.length - 1
+  const sampleType = sampleTypes[sampleTypeIndex]
+
+  const profileBuilder = new StackListProfileBuilder()
+
+  switch (sampleType.unit) {
+    case 'nanoseconds':
+    case 'microseconds':
+    case 'milliseconds':
+    case 'seconds':
+      profileBuilder.setValueFormatter(new TimeFormatter(sampleType.unit))
+      break
+
+    case 'bytes':
+      profileBuilder.setValueFormatter(new ByteFormatter())
+      break
+  }
+
+  for (let s of protoProfile.sample) {
+    const stack = s.locationId ? s.locationId.map(l => frameByLocationID.get(i32(l))) : []
+    stack.reverse()
+    const value = s.value![sampleTypeIndex]
+    profileBuilder.appendSampleWithWeight(stack.filter(f => f != null) as FrameInfo[], +value)
+  }
+
+  return profileBuilder.build()
+}

src/import/profile.proto

@@ -0,0 +1,206 @@
+// THIS FILE WAS IMPORTED FROM AN EXTERNAL SOURCE. DO NOT MODIFY THIS FILE
+// MANUALLY.
+//
+// Original from: https://github.com/google/pprof/blob/e027b50/proto/profile.proto
+//
+// This file is licensed under the Apache License 2.0
+// (https://github.com/google/pprof/blob/e027b5/LICENSE)
+
+// Profile is a common stacktrace profile format.
+//
+// Measurements represented with this format should follow the
+// following conventions:
+//
+// - Consumers should treat unset optional fields as if they had been
+//   set with their default value.
+//
+// - When possible, measurements should be stored in "unsampled" form
+//   that is most useful to humans.  There should be enough
+//   information present to determine the original sampled values.
+//
+// - On-disk, the serialized proto must be gzip-compressed.
+//
+// - The profile is represented as a set of samples, where each sample
+//   references a sequence of locations, and where each location belongs
+//   to a mapping.
+// - There is a N->1 relationship from sample.location_id entries to
+//   locations. For every sample.location_id entry there must be a
+//   unique Location with that id.
+// - There is an optional N->1 relationship from locations to
+//   mappings. For every nonzero Location.mapping_id there must be a
+//   unique Mapping with that id.
+
+syntax = "proto3";
+
+package perftools.profiles;
+
+option java_package = "com.google.perftools.profiles";
+option java_outer_classname = "ProfileProto";
+
+message Profile {
+  // A description of the samples associated with each Sample.value.
+  // For a cpu profile this might be:
+  //   [["cpu","nanoseconds"]] or [["wall","seconds"]] or [["syscall","count"]]
+  // For a heap profile, this might be:
+  //   [["allocations","count"], ["space","bytes"]],
+  // If one of the values represents the number of events represented
+  // by the sample, by convention it should be at index 0 and use
+  // sample_type.unit == "count".
+  repeated ValueType sample_type = 1;
+  // The set of samples recorded in this profile.
+  repeated Sample sample = 2;
+  // Mapping from address ranges to the image/binary/library mapped
+  // into that address range.  mapping[0] will be the main binary.
+  repeated Mapping mapping = 3;
+  // Useful program location
+  repeated Location location = 4;
+  // Functions referenced by locations
+  repeated Function function = 5;
+  // A common table for strings referenced by various messages.
+  // string_table[0] must always be "".
+  repeated string string_table = 6;
+  // frames with Function.function_name fully matching the following
+  // regexp will be dropped from the samples, along with their successors.
+  int64 drop_frames = 7; // Index into string table.
+  // frames with Function.function_name fully matching the following
+  // regexp will be kept, even if it matches drop_functions.
+  int64 keep_frames = 8; // Index into string table.
+
+  // The following fields are informational, do not affect
+  // interpretation of results.
+
+  // Time of collection (UTC) represented as nanoseconds past the epoch.
+  int64 time_nanos = 9;
+  // Duration of the profile, if a duration makes sense.
+  int64 duration_nanos = 10;
+  // The kind of events between sampled ocurrences.
+  // e.g [ "cpu","cycles" ] or [ "heap","bytes" ]
+  ValueType period_type = 11;
+  // The number of events between sampled occurrences.
+  int64 period = 12;
+  // Freeform text associated to the profile.
+  repeated int64 comment = 13; // Indices into string table.
+  // Index into the string table of the type of the preferred sample
+  // value. If unset, clients should default to the last sample value.
+  int64 default_sample_type = 14;
+}
+
+// ValueType describes the semantics and measurement units of a value.
+message ValueType {
+  int64 type = 1; // Index into string table.
+  int64 unit = 2; // Index into string table.
+}
+
+// Each Sample records values encountered in some program
+// context. The program context is typically a stack trace, perhaps
+// augmented with auxiliary information like the thread-id, some
+// indicator of a higher level request being handled etc.
+message Sample {
+  // The ids recorded here correspond to a Profile.location.id.
+  // The leaf is at location_id[0].
+  repeated uint64 location_id = 1;
+  // The type and unit of each value is defined by the corresponding
+  // entry in Profile.sample_type. All samples must have the same
+  // number of values, the same as the length of Profile.sample_type.
+  // When aggregating multiple samples into a single sample, the
+  // result has a list of values that is the elemntwise sum of the
+  // lists of the originals.
+  repeated int64 value = 2;
+  // label includes additional context for this sample. It can include
+  // things like a thread id, allocation size, etc
+  repeated Label label = 3;
+}
+
+message Label {
+  int64 key = 1; // Index into string table
+
+  // At most one of the following must be present
+  int64 str = 2; // Index into string table
+  int64 num = 3;
+
+  // Should only be present when num is present.
+  // Specifies the units of num.
+  // Use arbitrary string (for example, "requests") as a custom count unit.
+  // If no unit is specified, consumer may apply heuristic to deduce the unit.
+  // Consumers may also  interpret units like "bytes" and "kilobytes" as memory
+  // units and units like "seconds" and "nanoseconds" as time units,
+  // and apply appropriate unit conversions to these.
+  int64 num_unit = 4; // Index into string table
+}
+
+message Mapping {
+  // Unique nonzero id for the mapping.
+  uint64 id = 1;
+  // Address at which the binary (or DLL) is loaded into memory.
+  uint64 memory_start = 2;
+  // The limit of the address range occupied by this mapping.
+  uint64 memory_limit = 3;
+  // Offset in the binary that corresponds to the first mapped address.
+  uint64 file_offset = 4;
+  // The object this entry is loaded from.  This can be a filename on
+  // disk for the main binary and shared libraries, or virtual
+  // abstractions like "[vdso]".
+  int64 filename = 5; // Index into string table
+  // A string that uniquely identifies a particular program version
+  // with high probability. E.g., for binaries generated by GNU tools,
+  // it could be the contents of the .note.gnu.build-id field.
+  int64 build_id = 6; // Index into string table
+
+  // The following fields indicate the resolution of symbolic info.
+  bool has_functions = 7;
+  bool has_filenames = 8;
+  bool has_line_numbers = 9;
+  bool has_inline_frames = 10;
+}
+
+// Describes function and line table debug information.
+message Location {
+  // Unique nonzero id for the location.  A profile could use
+  // instruction addresses or any integer sequence as ids.
+  uint64 id = 1;
+  // The id of the corresponding profile.Mapping for this location.
+  // It can be unset if the mapping is unknown or not applicable for
+  // this profile type.
+  uint64 mapping_id = 2;
+  // The instruction address for this location, if available.  It
+  // should be within [Mapping.memory_start...Mapping.memory_limit]
+  // for the corresponding mapping. A non-leaf address may be in the
+  // middle of a call instruction. It is up to display tools to find
+  // the beginning of the instruction if necessary.
+  uint64 address = 3;
+  // Multiple line indicates this location has inlined functions,
+  // where the last entry represents the caller into which the
+  // preceding entries were inlined.
+  //
+  // E.g., if memcpy() is inlined into printf:
+  //    line[0].function_name == "memcpy"
+  //    line[1].function_name == "printf"
+  repeated Line line = 4;
+  // Provides an indication that multiple symbols map to this location's
+  // address, for example due to identical code folding by the linker. In that
+  // case the line information above represents one of the multiple
+  // symbols. This field must be recomputed when the symbolization state of the
+  // profile changes.
+  bool is_folded = 5;
+}
+
+message Line {
+  // The id of the corresponding profile.Function for this line.
+  uint64 function_id = 1;
+  // Line number in source code.
+  int64 line = 2;
+}
+
+message Function {
+  // Unique nonzero id for the function.
+  uint64 id = 1;
+  // Name of the function, in human-readable form if available.
+  int64 name = 2; // Index into string table
+  // Name of the function, as identified by the system.
+  // For instance, it can be a C++ mangled name.
+  int64 system_name = 3; // Index into string table
+  // Source file containing the function.
+  int64 filename = 4; // Index into string table
+  // Line number in source file.
+  int64 start_line = 5;
+}

src/import/safari.test.ts

@@ -0,0 +1,5 @@
+import {checkProfileSnapshot} from '../lib/test-utils'
+
+test('importFromSafari', async () => {
+  await checkProfileSnapshot('./sample/profiles/Safari/13.1/simple.html-recording.json')
+})

src/import/safari.ts

@@ -0,0 +1,120 @@
+import {Profile, FrameInfo, StackListProfileBuilder} from '../lib/profile'
+import {TimeFormatter} from '../lib/value-formatters'
+
+interface Record {
+  type: string
+  eventType?: string
+  startTime?: number
+  endTime?: number
+  // timeline-record-type-cpu
+  timestamp?: number
+  usage?: number
+  threads?: any[]
+  // timeline-record-type-script
+  details?: number | string | any
+  extraDetails?: null | any
+  // timeline-record-type-network
+  archiveStartTime?: number
+  entry?: any
+  // timeline-record-type-layout
+  quad?: number[]
+}
+
+interface ExprLocation {
+  line: number
+  column: number
+}
+
+interface StackFrame {
+  sourceID: string
+  name: string
+  line: number
+  column: number
+  url: string
+  expressionLocation?: ExprLocation
+}
+
+interface Sample {
+  timestamp: number
+  stackFrames: StackFrame[]
+}
+
+interface Recording {
+  displayName: string
+  startTime: number
+  endTime: number
+  discontinuities: any[]
+  instrumentTypes: string[]
+  records: Record[]
+  markers: any[]
+  memoryPressureEvents: any[]
+  sampleStackTraces: Sample[]
+  sampleDurations: number[]
+}
+
+interface Overview {
+  secondsPerPixel: number
+  scrollStartTime: number
+  selectionStartTime: number
+  selectionDuration: number
+}
+
+interface SafariProfile {
+  version: number
+  recording: Recording
+  overview: Overview
+}
+
+function makeStack(frames: StackFrame[]): FrameInfo[] {
+  return frames
+    .map(({name, url, line, column}) => ({
+      key: `${name}:${url}:${line}:${column}`,
+      file: url,
+      line,
+      col: column,
+      name: name || '(anonymous)',
+    }))
+    .reverse()
+}
+
+export function importFromSafari(contents: SafariProfile): Profile | null {
+  if (contents.version !== 1) {
+    console.warn(`Unknown Safari profile version ${contents.version}... Might be incompatible.`)
+  }
+
+  const {recording} = contents
+  const {sampleStackTraces, sampleDurations} = recording
+
+  const count = sampleStackTraces.length
+  if (count < 1) {
+    console.warn('Empty profile')
+    return null
+  }
+
+  const profileDuration =
+    sampleStackTraces[count - 1].timestamp - sampleStackTraces[0].timestamp + sampleDurations[0]
+  const profile = new StackListProfileBuilder(profileDuration)
+
+  let previousEndTime = Number.MAX_VALUE
+
+  sampleStackTraces.forEach((sample, i) => {
+    const endTime = sample.timestamp
+    const duration = sampleDurations[i]
+    const startTime = endTime - duration
+    const idleDurationBefore = startTime - previousEndTime
+
+    // FIXME: 2ms is a lot, but Safari's timestamps and durations don't line up very well and will create
+    // phantom idle time
+    if (idleDurationBefore > 0.002) {
+      profile.appendSampleWithWeight([], idleDurationBefore)
+    }
+
+    profile.appendSampleWithWeight(makeStack(sample.stackFrames), duration)
+
+    previousEndTime = endTime
+  })
+
+  profile.setValueFormatter(new TimeFormatter('seconds'))
+  profile.setName(recording.displayName)
+  return profile.build()
+}

src/import/trace-event.test.ts

@@ -0,0 +1,33 @@
+import {checkProfileSnapshot} from '../lib/test-utils'
+
+test('importTraceEvents simple', async () => {
+  await checkProfileSnapshot('./sample/profiles/trace-event/simple.json')
+})
+
+test('importTraceEvents simple object', async () => {
+  await checkProfileSnapshot('./sample/profiles/trace-event/simple-object.json')
+})
+
+test('importTraceEvents multiprocess', async () => {
+  await checkProfileSnapshot('./sample/profiles/trace-event/multiprocess.json')
+})
+
+test('importTraceEvents partial json import', async () => {
+  await checkProfileSnapshot('./sample/profiles/trace-event/simple-partial.json')
+})
+
+test('importTraceEvents partial json import trailing comma', async () => {
+  await checkProfileSnapshot('./sample/profiles/trace-event/simple-partial-trailing-comma.json')
+})
+
+test('importTraceEvents partial json import whitespace padding', async () => {
+  await checkProfileSnapshot('./sample/profiles/trace-event/simple-partial-whitespace.json')
+})
+
+test('importTraceEvents bad E events', async () => {
+  await checkProfileSnapshot('./sample/profiles/trace-event/too-many-end-events.json')
+})
+
+test('importTraceEvents event re-ordering', async () => {
+  await checkProfileSnapshot('./sample/profiles/trace-event/must-retain-original-order.json')
+})

src/import/trace-event.ts

@@ -0,0 +1,323 @@
+import {sortBy, zeroPad, lastOf} from '../lib/utils'
+import {ProfileGroup, CallTreeProfileBuilder, FrameInfo} from '../lib/profile'
+import {TimeFormatter} from '../lib/value-formatters'
+
+// This file concerns import from the "Trace Event Format", authored by Google
+// and used for Google's own chrome://trace.
+//
+// The file format is extremely general, and we only support the parts of it
+// that logically map onto speedscope's visualization capabilities.
+// Specifically, we only support the "B", "E", and "X" event types. Everything
+// else is ignored. We do, however, support import of profiles that are
+// multi-process/multi-threaded. Each process is split into a separate profile.
+//
+// Note that Chrome Developer Tools uses this format as well, but all the
+// relevant data used in those profiles is stored in events with the name
+// "CpuProfile", "Profile", or "ProfileChunk". If we detect those, we prioritize
+// importing the profile as a Chrome Developer Tools profile. Otherwise,
+// we try to import it as a "Trace Event Format" file.
+//
+// Spec: https://docs.google.com/document/d/1CvAClvFfyA5R-PhYUmn5OOQtYMH4h6I0nSsKchNAySU/preview
+
+interface TraceEvent {
+  // The process ID for the process that output this event.
+  pid: number
+
+  // The thread ID for the thread that output this event.
+  tid: number
+
+  // The event type. This is a single character which changes depending on the type of event being output. The valid values are listed in the table below. We will discuss each phase type below.
+  ph: string
+
+  // The tracing clock timestamp of the event. The timestamps are provided at microsecond granularity.
+  ts: number
+
+  // The thread clock timestamp of the event. The timestamps are provided at microsecond granularity.
+  tts?: number
+
+  // The name of the event, as displayed in Trace Viewer
+  name?: string
+
+  // The event categories. This is a comma separated list of categories for the event. The categories can be used to hide events in the Trace Viewer UI.
+  cat?: string
+
+  // Any arguments provided for the event. Some of the event types have required argument fields, otherwise, you can put any information you wish in here. The arguments are displayed in Trace Viewer when you view an event in the analysis section.
+  args: any
+
+  // A fixed color name to associate with the event. If provided, cname must be one of the names listed in trace-viewer's base color scheme's reserved color names list
+  cname?: string
+}
+
+interface BTraceEvent extends TraceEvent {
+  ph: 'B'
+}
+
+interface ETraceEvent extends TraceEvent {
+  ph: 'E'
+}
+
+interface XTraceEvent extends TraceEvent {
+  ph: 'X'
+  dur?: number
+  tdur?: number
+}
+
+// The trace format supports a number of event types that we ignore.
+type ImportableTraceEvent = BTraceEvent | ETraceEvent | XTraceEvent
+type DurationEvent = BTraceEvent | ETraceEvent
+
+function filterIgnoredEventTypes(events: TraceEvent[]): ImportableTraceEvent[] {
+  const ret: ImportableTraceEvent[] = []
+  for (let ev of events) {
+    switch (ev.ph) {
+      case 'B':
+      case 'E':
+      case 'X':
+        ret.push(ev as ImportableTraceEvent)
+    }
+  }
+  return ret
+}
+
+function convertToDurationEvents(events: ImportableTraceEvent[]): DurationEvent[] {
+  const ret: DurationEvent[] = []
+  for (let ev of events) {
+    switch (ev.ph) {
+      case 'B':
+        ret.push(ev)
+        break
+
+      case 'E':
+        ret.push(ev)
+        break
+
+      case 'X':
+        let dur: number | null = null
+        if (ev.dur != null) dur = ev.dur
+        else if (ev.tdur != null) dur = ev.tdur
+
+        if (dur == null) {
+          console.warn('Found a complete event (X) with no duration. Skipping: ', ev)
+          continue
+        }
+
+        ret.push({...ev, ph: 'B'} as BTraceEvent)
+        ret.push({...ev, ph: 'E', ts: ev.ts + dur} as ETraceEvent)
+        break
+
+      default:
+        const _exhaustiveCheck: never = ev
+        return _exhaustiveCheck
+    }
+  }
+  return ret
+}
+
+function getProcessNamesByPid(events: TraceEvent[]): Map<number, string> {
+  const processNamesByPid = new Map<number, string>()
+  for (let ev of events) {
+    if (ev.ph === 'M' && ev.name === 'process_name' && ev.args && ev.args.name) {
+      processNamesByPid.set(ev.pid, ev.args.name)
+    }
+  }
+  return processNamesByPid
+}
+
+function getThreadNamesByPidTid(events: TraceEvent[]): Map<string, string> {
+  const threadNameByPidTid = new Map<string, string>()
+
+  for (let ev of events) {
+    if (ev.ph === 'M' && ev.name === 'thread_name' && ev.args && ev.args.name) {
+      const key = `${ev.pid}:${ev.tid}`
+      threadNameByPidTid.set(key, ev.args.name)
+    }
+  }
+  return threadNameByPidTid
+}
+
+function keyForEvent(event: TraceEvent): string {
+  let name = `${event.name || '(unnamed)'}`
+  if (event.args) {
+    name += ` ${JSON.stringify(event.args)}`
+  }
+  return name
+}
+
+type TraceEventProfileState = {profile: CallTreeProfileBuilder; eventStack: BTraceEvent[]}
+
+function eventListToProfileGroup(events: TraceEvent[]): ProfileGroup {
+  const stateByPidTid = new Map<string, TraceEventProfileState>()
+
+  const importableEvents = filterIgnoredEventTypes(events)
+  const durationEvents = convertToDurationEvents(importableEvents)
+
+  const processNamesByPid = getProcessNamesByPid(events)
+  const threadNamesByPidTid = getThreadNamesByPidTid(events)
+
+  durationEvents.sort((a, b) => {
+    if (a.ts < b.ts) return -1
+    if (a.ts > b.ts) return 1
+    if (a.pid < b.pid) return -1
+    if (a.pid > b.pid) return 1
+    if (a.tid < b.tid) return -1
+    if (a.tid > b.tid) return 1
+
+    // We have to be careful with events that have the same timestamp
+    // and the same pid/tid
+    const aKey = keyForEvent(a)
+    const bKey = keyForEvent(b)
+    if (aKey === bKey) {
+      // If the two elements have the same key, we need to process the begin
+      // event before the end event. This will be a zero-duration event.
+      if (a.ph === 'B' && b.ph === 'E') return -1
+      if (a.ph === 'E' && b.ph === 'B') return 1
+    } else {
+      // If the two elements have *different* keys, we want to process
+      // the end of an event before the beginning of the event to prevent
+      // out-of-order push/pops from the call-stack.
+      if (a.ph === 'B' && b.ph === 'E') return 1
+      if (a.ph === 'E' && b.ph === 'B') return -1
+    }
+
+    // In all other cases, retain the original sort order.
+    return 0
+  })
+
+  if (durationEvents.length > 0) {
+    const firstTs = durationEvents[0].ts
+    for (let ev of durationEvents) {
+      ev.ts -= firstTs
+    }
+  }
+
+  function getOrCreateProfileState(pid: number, tid: number): TraceEventProfileState {
+    // We zero-pad the PID and TID to make sorting them by pid/tid pair later easier.
+    const pidTid = `${zeroPad('' + pid, 10)}:${zeroPad('' + tid, 10)}`
+
+    let state = stateByPidTid.get(pidTid)
+    if (state != null) return state
+    let profile = new CallTreeProfileBuilder()
+    state = {profile, eventStack: []}
+    profile.setValueFormatter(new TimeFormatter('microseconds'))
+    stateByPidTid.set(pidTid, state)
+
+    const processName = processNamesByPid.get(pid)
+    const threadName = threadNamesByPidTid.get(`${pid}:${tid}`)
+
+    if (processName != null && threadName != null) {
+      profile.setName(`${processName} (pid ${pid}), ${threadName} (tid ${tid})`)
+    } else if (processName != null) {
+      profile.setName(`${processName} (pid ${pid}, tid ${tid})`)
+    } else if (threadName != null) {
+      profile.setName(`${threadName} (pid ${pid}, tid ${tid})`)
+    } else {
+      profile.setName(`pid ${pid}, tid ${tid}`)
+    }
+
+    return state
+  }
+
+  for (let ev of durationEvents) {
+    const {profile, eventStack} = getOrCreateProfileState(ev.pid, ev.tid)
+    const key = keyForEvent(ev)
+    const frameInfo: FrameInfo = {
+      key: key,
+      name: key,
+    }
+    switch (ev.ph) {
+      case 'B':
+        eventStack.push(ev)
+        profile.enterFrame(frameInfo, ev.ts)
+        break
+
+      case 'E':
+        const lastEvent = lastOf(eventStack)
+        if (lastEvent != null && lastEvent.name === ev.name) {
+          profile.leaveFrame(frameInfo, ev.ts)
+          eventStack.pop()
+        } else {
+          console.warn(
+            'Event discarded because it did not match top-of-stack. Discarded event:',
+            ev,
+            'Top of stack:',
+            lastEvent,
+          )
+        }
+        break
+
+      default:
+        const _exhaustiveCheck: never = ev
+        return _exhaustiveCheck
+    }
+  }
+
+  // For now, we just sort processes by pid & tid.
+  // TODO: The standard specifies that metadata events with the name
+  // "process_sort_index" and "thread_sort_index" can be used to influence the
+  // order, but for simplicity we'll ignore that until someone complains :)
+  const profilePairs = Array.from(stateByPidTid.entries())
+  sortBy(profilePairs, p => p[0])
+
+  return {name: '', indexToView: 0, profiles: profilePairs.map(p => p[1].profile)}
+}
+
+function isTraceEventList(maybeEventList: any): maybeEventList is TraceEvent[] {
+  if (!Array.isArray(maybeEventList)) return false
+  if (maybeEventList.length === 0) return false
+
+  // Both ph and ts should be provided for every event. In theory, many other
+  // fields are mandatory, but without these fields, we won't usefully be able
+  // to import the data, so we'll rely upon these.
+  for (let el of maybeEventList) {
+    if (!('ph' in el)) {
+      return false
+    }
+
+    switch (el.ph) {
+      case 'B':
+      case 'E':
+      case 'X':
+        // All B, E, and X events must have a timestamp specified, otherwise we
+        // won't be able to import correctly.
+        if (!('ts' in el)) {
+          return false
+        }
+
+      case 'M':
+        // It's explicitly okay for "M" (metadata) events not to specify a "ts"
+        // field, since usually there is no logical timestamp for them to have
+        break
+    }
+  }
+
+  return true
+}
+
+function isTraceEventObject(
+  maybeTraceEventObject: any,
+): maybeTraceEventObject is {traceEvents: TraceEvent[]} {
+  if (!('traceEvents' in maybeTraceEventObject)) return false
+  return isTraceEventList(maybeTraceEventObject['traceEvents'])
+}
+
+export function isTraceEventFormatted(
+  rawProfile: any,
+): rawProfile is {traceEvents: TraceEvent[]} | TraceEvent[] {
+  // We're only going to support the JSON formatted profiles for now.
+  // The spec also discusses support for data embedded in ftrace supported data: https://lwn.net/Articles/365835/.
+
+  return isTraceEventObject(rawProfile) || isTraceEventList(rawProfile)
+}
+
+export function importTraceEvents(
+  rawProfile: {traceEvents: TraceEvent[]} | TraceEvent[],
+): ProfileGroup {
+  if (isTraceEventObject(rawProfile)) {
+    return eventListToProfileGroup(rawProfile.traceEvents)
+  } else if (isTraceEventList(rawProfile)) {
+    return eventListToProfileGroup(rawProfile)
+  } else {
+    const _exhaustiveCheck: never = rawProfile
+    return _exhaustiveCheck
+  }
+}

src/import/utils.ts

@@ -0,0 +1,103 @@
+import * as pako from 'pako'
+
+export interface ProfileDataSource {
+  name(): Promise<string>
+  readAsArrayBuffer(): Promise<ArrayBuffer>
+  readAsText(): Promise<string>
+}
+
+export class TextProfileDataSource implements ProfileDataSource {
+  constructor(private fileName: string, private contents: string) {}
+  async name() {
+    return this.fileName
+  }
+  async readAsArrayBuffer() {
+    // JavaScript strings are UTF-16 encoded, but if this string is
+    // constructed based on
+
+    // TODO(jlfwong): Might want to make this construct an array
+    // buffer based on the text
+    return new ArrayBuffer(0)
+  }
+  async readAsText() {
+    return this.contents
+  }
+}
+
+export class MaybeCompressedDataReader implements ProfileDataSource {
+  private uncompressedData: Promise<ArrayBuffer>
+
+  constructor(
+    private namePromise: Promise<string>,
+    maybeCompressedDataPromise: Promise<ArrayBuffer>,
+  ) {
+    this.uncompressedData = maybeCompressedDataPromise.then(async (fileData: ArrayBuffer) => {
+      try {
+        const result = pako.inflate(new Uint8Array(fileData)).buffer
+        return result
+      } catch (e) {
+        return fileData
+      }
+    })
+  }
+
+  async name(): Promise<string> {
+    return await this.namePromise
+  }
+
+  async readAsArrayBuffer(): Promise<ArrayBuffer> {
+    return await this.uncompressedData
+  }
+
+  async readAsText(): Promise<string> {
+    const buffer = await this.readAsArrayBuffer()
+
+    // By default, we assume the file is utf-8 encoded.
+    let encoding = 'utf-8'
+
+    const array = new Uint8Array(buffer)
+    if (array.length > 2) {
+      if (array[0] === 0xff && array[1] === 0xfe) {
+        // UTF-16, Little Endian encoding
+        encoding = 'utf-16le'
+      } else if (array[0] === 0xfe && array[1] === 0xff) {
+        // UTF-16, Big Endian encoding
+        encoding = 'utf-16be'
+      }
+    }
+
+    if (typeof TextDecoder !== 'undefined') {
+      const decoder = new TextDecoder(encoding)
+      return decoder.decode(buffer)
+    } else {
+      // JavaScript strings are UTF-16 encoded, but we're reading data from disk
+      // that we're going to blindly assume it's ASCII encoded. This codepath
+      // only exists for older browser support.
+      console.warn('This browser does not support TextDecoder. Decoding text as ASCII.')
+      let ret: string = ''
+      for (let i = 0; i < array.length; i++) {
+        ret += String.fromCharCode(array[i])
+      }
+      return ret
+    }
+  }
+
+  static fromFile(file: File): MaybeCompressedDataReader {
+    const maybeCompressedDataPromise: Promise<ArrayBuffer> = new Promise(resolve => {
+      const reader = new FileReader()
+      reader.addEventListener('loadend', () => {
+        if (!(reader.result instanceof ArrayBuffer)) {
+          throw new Error('Expected reader.result to be an instance of ArrayBuffer')
+        }
+        resolve(reader.result)
+      })
+      reader.readAsArrayBuffer(file)
+    })
+
+    return new MaybeCompressedDataReader(Promise.resolve(file.name), maybeCompressedDataPromise)
+  }
+
+  static fromArrayBuffer(name: string, buffer: ArrayBuffer): MaybeCompressedDataReader {
+    return new MaybeCompressedDataReader(Promise.resolve(name), Promise.resolve(buffer))
+  }
+}

src/import/v8cpuFormatter.ts

@@ -0,0 +1,71 @@
+import {CPUProfile, CPUProfileNode} from './chrome'
+
+/**
+ * This importer handles an old format used by the C++ API of V8. This format is still used by v8-profiler-node8.
+ * There are two differences between the two formats:
+ *  - Nodes are a tree in the old format and a flat array in the new format
+ *  - Weights are timestamps in the old format and deltas in the new format.
+ *
+ * For more information, see https://github.com/hyj1991/v8-profiler-node8
+ */
+
+interface OldCPUProfileNode {
+  functionName: string
+  lineNumber: number
+  scriptId: string
+  url: string
+  hitCount: number
+  bailoutReason: string
+  id: number
+  children: OldCPUProfileNode[]
+}
+
+export interface OldCPUProfile {
+  startTime: number
+  endTime: number
+  head: OldCPUProfileNode
+  samples: number[]
+  timestamps: number[]
+}
+
+function treeToArray(root: OldCPUProfileNode): CPUProfileNode[] {
+  const nodes: CPUProfileNode[] = []
+  function visit(node: OldCPUProfileNode) {
+    nodes.push({
+      id: node.id,
+      callFrame: {
+        columnNumber: 0,
+        functionName: node.functionName,
+        lineNumber: node.lineNumber,
+        scriptId: node.scriptId,
+        url: node.url,
+      },
+      hitCount: node.hitCount,
+      children: node.children.map(child => child.id),
+    })
+    node.children.forEach(visit)
+  }
+  visit(root)
+  return nodes
+}
+
+function timestampsToDeltas(timestamps: number[], startTime: number): number[] {
+  return timestamps.map((timestamp, index) => {
+    const lastTimestamp = index === 0 ? startTime * 1000000 : timestamps[index - 1]
+    return timestamp - lastTimestamp
+  })
+}
+
+/**
+ * Convert the old tree-based format to the new flat-array based format
+ */
+export function chromeTreeToNodes(content: OldCPUProfile): CPUProfile {
+  // Note that both startTime and endTime are now in microseconds
+  return {
+    samples: content.samples,
+    startTime: content.startTime * 1000000,
+    endTime: content.endTime * 1000000,
+    nodes: treeToArray(content.head),
+    timeDeltas: timestampsToDeltas(content.timestamps, content.startTime),
+  }
+}

src/import/v8heapalloc.test.ts

@@ -0,0 +1,9 @@
+import {checkProfileSnapshot} from '../lib/test-utils'
+
+test('importV8HeapAlloc from Chrome', async () => {
+  await checkProfileSnapshot('./sample/profiles/Chrome/69/Heap-20181005T144546.heapprofile')
+})
+
+test('importV8HeapAlloc from NodeJS', async () => {
+  await checkProfileSnapshot('./sample/profiles/node/10.11.0/Heap-20181003T105432.heapprofile')
+})

src/import/v8heapalloc.ts

@@ -0,0 +1,109 @@
+import {Profile, FrameInfo, StackListProfileBuilder} from '../lib/profile'
+import {getOrInsert} from '../lib/utils'
+import {ByteFormatter} from '../lib/value-formatters'
+
+/**
+ * The V8 Heap Allocation profile is a way to represent heap allocation for each
+ * javascript function. The format is a simple tree where the weight of each node
+ * represent the memory allocated by the function and all its callee.
+ * You can find more information on how to get a profile there :
+ * https://developers.google.com/web/tools/chrome-devtools/memory-problems/#allocation-profile
+ * You need to scroll down to "Investigate memory allocation by function"
+ *
+ * Note that Node.JS can retrieve this kind of profile via the Inspector protocol.
+ */
+
+interface HeapProfileCallFrame {
+  columnNumber: number
+  functionName: string
+  lineNumber: number
+  scriptId: string
+  url: string
+}
+
+interface HeapProfileNode {
+  callFrame: HeapProfileCallFrame
+  selfSize: number
+  children: HeapProfileNode[]
+  id: number
+  parent?: number
+  totalSize: number
+}
+
+interface HeapProfile {
+  head: HeapProfileNode
+}
+
+const callFrameToFrameInfo = new Map<HeapProfileCallFrame, FrameInfo>()
+function frameInfoForCallFrame(callFrame: HeapProfileCallFrame) {
+  return getOrInsert(callFrameToFrameInfo, callFrame, callFrame => {
+    const name = callFrame.functionName || '(anonymous)'
+    const file = callFrame.url
+    const line = callFrame.lineNumber
+    const col = callFrame.columnNumber
+    return {
+      key: `${name}:${file}:${line}:${col}`,
+      name,
+      file,
+      line,
+      col,
+    }
+  })
+}
+
+export function importFromChromeHeapProfile(chromeProfile: HeapProfile): Profile {
+  const nodeById = new Map<number, HeapProfileNode>()
+  let currentId = 0
+  const computeId = (node: HeapProfileNode, parent?: HeapProfileNode) => {
+    node.id = currentId++
+    nodeById.set(node.id, node)
+    if (parent) {
+      node.parent = parent.id
+    }
+
+    node.children.forEach(children => computeId(children, node))
+  }
+  computeId(chromeProfile.head)
+
+  // Compute the total size
+  const computeTotalSize = (node: HeapProfileNode): number => {
+    if (node.children.length === 0) return node.selfSize || 0
+    const totalChild = node.children.reduce((total: number, children) => {
+      total += computeTotalSize(children)
+      return total
+    }, node.selfSize)
+    node.totalSize = totalChild
+    return totalChild
+  }
+  const total = computeTotalSize(chromeProfile.head)
+
+  // Compute all stacks by taking each last node and going upward
+  const stacks: HeapProfileNode[][] = []
+  for (let currentNode of nodeById.values()) {
+    let stack: HeapProfileNode[] = []
+    stack.push(currentNode)
+    // While we found a parent
+    while (true) {
+      if (currentNode.parent === undefined) break
+      const parent = nodeById.get(currentNode.parent)
+      if (parent === undefined) break
+      // Push the parent at the beginning of the stack
+      stack.unshift(parent)
+      currentNode = parent
+    }
+    stacks.push(stack)
+  }
+
+  const profile = new StackListProfileBuilder(total)
+
+  for (let stack of stacks) {
+    const lastFrame = stack[stack.length - 1]
+    profile.appendSampleWithWeight(
+      stack.map(frame => frameInfoForCallFrame(frame.callFrame)),
+      lastFrame.selfSize,
+    )
+  }
+
+  profile.setValueFormatter(new ByteFormatter())
+  return profile.build()
+}

src/jest-setup.js

@@ -0,0 +1,57 @@
+// Versions of node before 10 had an unstable sort. This isn't really an issue in browsers
+// that speedscope supports, but for the purposes of supporting node 10, we'll polyfill
+// a stable sort to make the tests pass.
+//
+// See:
+// - https://v8.dev/features/stable-sort
+// - https://v8.dev/blog/array-sort
+// - https://github.com/jlfwong/speedscope/pull/254#issuecomment-575116995
+//
+// Once we stop supporting node 10, this can be removed.
+//
+// An alternative would be to change our sort implementation to be stable by definition
+// rather than relying upon native sort being stable. I don't want to do that because
+// we'd take a perf hit.
+//
+// Because we're not going to use this in our actual build, it's okay for this
+// to be inefficient.
+
+;(function () {
+  const nodeVersion = process.versions.node
+  const versionParts = nodeVersion.split('.')
+  const majorVersion = parseInt(versionParts[0], 10)
+
+  if (majorVersion > 10) {
+    // Don't need to do the patch for newer node versions
+    return
+  }
+
+  const defaultCompareFunction = (a, b) => {
+    const sa = '' + a
+    const sb = '' + b
+    if (sa < sb) return -1
+    if (sa > sb) return 1
+    return 0
+  }
+
+  const originalSort = Array.prototype.sort
+  Array.prototype.sort = function (compareFunction) {
+    const arrayWithIndices = this.map((x, i) => [x, i])
+    originalSort.call(arrayWithIndices, (a, b) => {
+      if (!compareFunction) {
+        compareFunction = defaultCompareFunction
+      }
+      const res = compareFunction(a[0], b[0])
+      if (res !== 0) return res
+      return a[1] < b[1] ? -1 : 1
+    })
+    this.splice(0, this.length, ...arrayWithIndices.map(x => x[0]))
+    return this
+  }
+})()
+;(function () {
+  // TextDecoder is a global API in browsers, but an imported API in node.
+  //
+  // Let's emulate it being a global API during tests.
+  global.TextDecoder = require('util').TextDecoder
+})()

src/lib/__snapshots__/file-format.test.ts.snap

@@ -211,3 +211,7 @@ Object {
 exports[`importSpeedscopeProfiles 0.6.0 multiple profiles: indexToView 1`] = `1`;
 
 exports[`importSpeedscopeProfiles 0.6.0 multiple profiles: profileGroup.name 1`] = `"Two Samples"`;
+
+exports[`importSpeedscopeProfiles invalid due to incomplete trace 1`] = `"Tried to complete profile construction with a non-empty stack"`;
+
+exports[`importSpeedscopeProfiles invalid due to out of order events 1`] = `"Tried to leave frame \\"B\\" while frame \\"A\\" was at the top at 4"`;

src/lib/canvas-2d-batch-renderers.ts

@@ -0,0 +1,69 @@
+// This file contains a collection of classes which make it easier to perform
+// batch rendering of Canvas2D primitives. The advantage of this over just doing
+// ctx.beginPath() ... ctx.rect(...) ... ctx.endPath() is that you can construct
+// several different batch renderers are the same time, then decide on their
+// paint order at the end.
+//
+// See FlamechartPanZoomView.renderOverlays for an example of how this is used.
+
+export interface TextArgs {
+  text: string
+  x: number
+  y: number
+}
+
+export class BatchCanvasTextRenderer {
+  private argsBatch: TextArgs[] = []
+
+  text(args: TextArgs) {
+    this.argsBatch.push(args)
+  }
+
+  fill(ctx: CanvasRenderingContext2D, color: string) {
+    if (this.argsBatch.length === 0) return
+    ctx.fillStyle = color
+    for (let args of this.argsBatch) {
+      ctx.fillText(args.text, args.x, args.y)
+    }
+    this.argsBatch = []
+  }
+}
+
+export interface RectArgs {
+  x: number
+  y: number
+  w: number
+  h: number
+}
+
+export class BatchCanvasRectRenderer {
+  private argsBatch: RectArgs[] = []
+
+  rect(args: RectArgs) {
+    this.argsBatch.push(args)
+  }
+
+  private drawPath(ctx: CanvasRenderingContext2D) {
+    ctx.beginPath()
+    for (let args of this.argsBatch) {
+      ctx.rect(args.x, args.y, args.w, args.h)
+    }
+    ctx.closePath()
+    this.argsBatch = []
+  }
+
+  fill(ctx: CanvasRenderingContext2D, color: string) {
+    if (this.argsBatch.length === 0) return
+    ctx.fillStyle = color
+    this.drawPath(ctx)
+    ctx.fill()
+  }
+
+  stroke(ctx: CanvasRenderingContext2D, color: string, lineWidth: number) {
+    if (this.argsBatch.length === 0) return
+    ctx.strokeStyle = color
+    ctx.lineWidth = lineWidth
+    this.drawPath(ctx)
+    ctx.stroke()
+  }
+}

src/lib/color.ts

@@ -15,19 +15,19 @@ export class Color {
     // https://en.wikipedia.org/wiki/HSL_and_HSV#From_luma/chroma/hue
 
     const hPrime = H / 60
-    const X = C * (1 - Math.abs(hPrime % 2 - 1))
+    const X = C * (1 - Math.abs((hPrime % 2) - 1))
     const [R1, G1, B1] =
       hPrime < 1
         ? [C, X, 0]
         : hPrime < 2
-          ? [X, C, 0]
-          : hPrime < 3
-            ? [0, C, X]
-            : hPrime < 4
-              ? [0, X, C]
-              : hPrime < 5
-                ? [X, 0, C]
-                : [C, 0, X]
+        ? [X, C, 0]
+        : hPrime < 3
+        ? [0, C, X]
+        : hPrime < 4
+        ? [0, X, C]
+        : hPrime < 5
+        ? [X, 0, C]
+        : [C, 0, X]
 
     const m = L - (0.3 * R1 + 0.59 * G1 + 0.11 * B1)
 

src/lib/emscripten.test.ts

@@ -11,7 +11,13 @@ test('importEmscriptenSymbolMap', () => {
         'c:C',
       ].join('\n'),
     ),
-  ).toEqual(new Map([['a', 'A'], ['b', 'B'], ['c', 'C']]))
+  ).toEqual(
+    new Map([
+      ['a', 'A'],
+      ['b', 'B'],
+      ['c', 'C'],
+    ]),
+  )
 
   // Valid symbol map with trailing newline
   expect(
@@ -25,7 +31,14 @@ test('importEmscriptenSymbolMap', () => {
         '',
       ].join('\n'),
     ),
-  ).toEqual(new Map([['a', 'A'], ['b', 'B'], ['c', 'C'], ['d', 'D-D']]))
+  ).toEqual(
+    new Map([
+      ['a', 'A'],
+      ['b', 'B'],
+      ['c', 'C'],
+      ['d', 'D-D'],
+    ]),
+  )
 
   // Valid symbol map with non-alpha characters
   expect(importEmscriptenSymbolMap('u6:__ZN8tinyxml210XMLCommentD0Ev\n')).toEqual(
@@ -41,6 +54,10 @@ test('importEmscriptenSymbolMap', () => {
         '1:B',
         '2:C',
         '3:D-D',
+        '4:a\\20b',
+        '5:a\\2',
+        '6:a\\3z',
+        '7:a\\20b\\20c',
       ].join('\n'),
     ),
   ).toEqual(
@@ -49,6 +66,10 @@ test('importEmscriptenSymbolMap', () => {
       ['wasm-function[1]', 'B'],
       ['wasm-function[2]', 'C'],
       ['wasm-function[3]', 'D-D'],
+      ['wasm-function[4]', 'a b'],
+      ['wasm-function[5]', 'a\\2'],
+      ['wasm-function[6]', 'a\\3z'],
+      ['wasm-function[7]', 'a b c'],
     ]),
   )
 

src/lib/emscripten.ts

@@ -1,5 +1,15 @@
 type EmscriptenSymbolMap = Map<string, string>
 
+// Returns `input` with hex escapes expanded (e.g. `\20` becomes ` `.)
+//
+// NOTE: This will fail to ignore escaped backslahes (e.g. `\\20`).
+function unescapeHex(input: string): string {
+  return input.replace(/\\([a-fA-F0-9]{2})/g, (_match, group) => {
+    const scalar = parseInt(group, 16)
+    return String.fromCharCode(scalar)
+  })
+}
+
 // This imports symbol maps generated by emscripten using the "--emit-symbol-map" flag.
 // It allows you to visualize a profile captured in a release build as long as you also
 // have the associated symbol map. To do this, first drop the profile into speedscope
@@ -14,21 +24,21 @@ export function importEmscriptenSymbolMap(contents: string): EmscriptenSymbolMap
   if (!lines.length) return null
 
   const map: EmscriptenSymbolMap = new Map()
-  const intRegex = /^(\d+):([\$\w-]+)$/
+  const intRegex = /^(\d+):(.+)$/
   const idRegex = /^([\$\w]+):([\$\w-]+)$/
 
   for (const line of lines) {
     // Match lines like "103:__ZN8tinyxml210XMLCommentD0Ev"
     const intMatch = intRegex.exec(line)
     if (intMatch) {
-      map.set(`wasm-function[${intMatch[1]}]`, intMatch[2])
+      map.set(`wasm-function[${intMatch[1]}]`, unescapeHex(intMatch[2]))
       continue
     }
 
     // Match lines like "u6:__ZN8tinyxml210XMLCommentD0Ev"
     const idMatch = idRegex.exec(line)
     if (idMatch) {
-      map.set(idMatch[1], idMatch[2])
+      map.set(idMatch[1], unescapeHex(idMatch[2]))
       continue
     }
 

src/lib/file-format.test.ts

@@ -1,6 +1,6 @@
-import {checkProfileSnapshot} from './test-utils'
+import {checkProfileSnapshot, expectImportFailure} from './test-utils'
 
-describe('importSpeedscopeProfiles', async () => {
+describe('importSpeedscopeProfiles', () => {
   test('0.0.1 evented profile', async () => {
     await checkProfileSnapshot('./sample/profiles/speedscope/0.0.1/simple.speedscope.json')
   })
@@ -12,4 +12,13 @@ describe('importSpeedscopeProfiles', async () => {
   test('0.6.0 multiple profiles', async () => {
     await checkProfileSnapshot('./sample/profiles/speedscope/0.6.0/two-sampled.speedscope.json')
   })
+
+  test('invalid due to out of order events', async () => {
+    // See: https://github.com/jlfwong/speedscope/issues/272
+    await expectImportFailure('./sample/profiles/speedscope/invalid/out-of-order-events.json')
+  })
+
+  test('invalid due to incomplete trace', async () => {
+    await expectImportFailure('./sample/profiles/speedscope/invalid/incomplete-trace.json')
+  })
 })

src/lib/file-format.ts

@@ -138,7 +138,10 @@ function importSpeedscopeProfile(
     for (let i = 0; i < samples.length; i++) {
       const stack = samples[i]
       const weight = weights[i]
-      profile.appendSampleWithWeight(stack.map(n => frameInfos[n]), weight)
+      profile.appendSampleWithWeight(
+        stack.map(n => frameInfos[n]),
+        weight,
+      )
     }
 
     return profile.build()

src/lib/flamechart.ts

@@ -1,7 +1,7 @@
 import {Frame, CallTreeNode} from './profile'
 
 import {lastOf} from './utils'
-import {clamp} from './math'
+import {clamp, Rect, Vec2} from './math'
 
 export interface FlamechartFrame {
   node: CallTreeNode
@@ -90,6 +90,27 @@ export class Flamechart {
     return clamp(viewportWidth, minWidth, maxWidth)
   }
 
+  // Given a desired config-space viewport rectangle, clamp the rectangle so
+  // that it fits within the given flamechart. This prevents the viewport from
+  // extending past the bounds of the flamechart or zooming in too far.
+  getClampedConfigSpaceViewportRect({
+    configSpaceViewportRect,
+    renderInverted,
+  }: {
+    configSpaceViewportRect: Rect
+    renderInverted?: boolean
+  }) {
+    const configSpaceSize = new Vec2(this.getTotalWeight(), this.getLayers().length)
+    const width = this.getClampedViewportWidth(configSpaceViewportRect.size.x)
+    const size = configSpaceViewportRect.size.withX(width)
+    const origin = Vec2.clamp(
+      configSpaceViewportRect.origin,
+      new Vec2(0, renderInverted ? 0 : -1),
+      Vec2.max(Vec2.zero, configSpaceSize.minus(size).plus(new Vec2(0, 1))),
+    )
+    return new Rect(origin, configSpaceViewportRect.size.withX(width))
+  }
+
   constructor(private source: FlamechartDataSource) {
     const stack: FlamechartFrame[] = []
     const openFrame = (node: CallTreeNode, value: number) => {